mediaType に mp4Media を追加する

[sile]

以下のように mp4Media を追加して、MP4 ファイルから配信を行えるようにしました。
将来的には、ローカルファイルからだけでなく URL で MP4 ファイルを指定できるようにするかもしれません。

---

This pull request introduces support for handling MP4 media streams, along with several updates to dependencies and configurations. The key changes include adding a new media type, updating relevant files to support this new feature, and modifying dependencies to include the necessary libraries.

New Feature: MP4 Media Stream Support

• CHANGES.md: Added mp4Media to mediaType for handling H.264 + Opus MP4 files, initially supported on Chrome and Edge. ([CHANGES.mdR14-R17](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-d975bf659606195d2165918f93e1cf680ef68ea3c9cab994f033705fea8238b2R14-R17))
• instructions.json: Added description for mp4File to specify the MP4 file to be used when mp4Media is selected. ([instructions.jsonR98-R100](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-d4a451ad2863e5577b7cc521ab817f447f4a7c53c11bf6281e7fc34511f35f2aR98-R100))
• src/app/actions.ts: Updated createMediaStreamPickedState to include mp4MediaStream and added logic to handle mp4Media type. ([[1]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-f614e3891e365664ae453d152ad62d608f4f5fa9708ead03b11241130e00af00L462-R462), [[2]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-f614e3891e365664ae453d152ad62d608f4f5fa9708ead03b11241130e00af00R483), [[3]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-f614e3891e365664ae453d152ad62d608f4f5fa9708ead03b11241130e00af00L495-R496), [[4]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-f614e3891e365664ae453d152ad62d608f4f5fa9708ead03b11241130e00af00R674-R678), [[5]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-f614e3891e365664ae453d152ad62d608f4f5fa9708ead03b11241130e00af00R1688), [[6]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-f614e3891e365664ae453d152ad62d608f4f5fa9708ead03b11241130e00af00R1785), [[7]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-f614e3891e365664ae453d152ad62d608f4f5fa9708ead03b11241130e00af00R1999))
• src/app/slice.ts: Added mp4MediaStream to the initial state and created a new action setMp4MediaStream. ([[1]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-45bfbe03821b84e4fcd3d64b38e126de5d7b7a7a7537adf8a7088fb9c9c6194eR3), [[2]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-45bfbe03821b84e4fcd3d64b38e126de5d7b7a7a7537adf8a7088fb9c9c6194eR96), [[3]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-45bfbe03821b84e4fcd3d64b38e126de5d7b7a7a7537adf8a7088fb9c9c6194eR292-R294))
• src/app/store.ts: Included setMp4MediaStream in the list of serializable actions and paths ignored by the Redux store. ([src/app/store.tsR20-R27](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-efbc9c2c3c62a72fb9d047216d1c0ed4a8223e51ce11cbcbb30a7a0a6049d042R20-R27))

Dependency Updates

• package.json: Added @shiguredo/mp4-media-stream dependency. ([package.jsonR30](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519R30))
• pnpm-lock.yaml: Updated to include the new @shiguredo/mp4-media-stream package and reverted several other dependencies to previous versions for compatibility. ([[1]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbR17-R19), [[2]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbR681-R683), [[3]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL794-R801), [[4]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL807-R814), [[5]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL912-R919), [[6]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL1088-R1095), [[7]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL1280-R1287), [[8]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL1295-R1305), [[9]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL1467-R1473), [[10]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL1502-R1508), [[11]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL1548-R1554), [[12]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbR1915-R1916), [[13]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2056-R2077), [[14]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2109-R2117), [[15]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2162-R2170), [[16]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2321-R2329), [[17]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2355-R2363), [[18]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2368-R2382), [[19]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2575-R2601), [[20]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2617-R2629), [[21]](https://github.com/shiguredo/sora-devtools/pull/593/files#diff-32824c984905bb02bc7ffcef96a77addd1f1602cff71a11fbbfdd7f53ee026bbL2668-R2676))

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[voluntas]

動作確認できました。 +1 です。