Add useFlatInnerBlocks hook

[fabiankaegy]

Description of the Change

Add a new hook called useFlatInnerBlocks which gets a list of all the inner blocks in a flat array.

Changelog Entry

Added - useFlatInnerBlocks hook

Credits

Props @fabiankaegy

[github-actions]

Size Change: +185 B (+0.29%)

Total Size: 63.7 kB

Filename	Size	Change
dist/index.js	63.7 kB	+185 B (+0.29%)

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