feat: add Webview::show and Webview::hide

[amrbashir]

closes #11126

[github-actions]

Package Changes Through 8dc534b

There are 10 changes which include tauri with prerelease, @tauri-apps/api with prerelease, tauri-bundler with prerelease, tauri-cli with prerelease, tauri-runtime-wry with prerelease, tauri-runtime with prerelease, tauri-utils with prerelease, @tauri-apps/cli with prerelease, tauri-build with prerelease, tauri-codegen with prerelease

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.0.0-rc.5	2.0.0-rc.6
tauri-utils	2.0.0-rc.12	2.0.0-rc.13
tauri-bundler	2.0.1-rc.13	2.0.1-rc.14
tauri-runtime	2.0.0-rc.12	2.0.0-rc.13
tauri-runtime-wry	2.0.0-rc.13	2.0.0-rc.14
tauri-codegen	2.0.0-rc.12	2.0.0-rc.13
tauri-macros	2.0.0-rc.11	2.0.0-rc.12
tauri-plugin	2.0.0-rc.12	2.0.0-rc.13
tauri-build	2.0.0-rc.12	2.0.0-rc.13
tauri	2.0.0-rc.15	2.0.0-rc.16
@tauri-apps/cli	2.0.0-rc.16	2.0.0-rc.17
tauri-cli	2.0.0-rc.16	2.0.0-rc.17

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[Legend-Master]

Didn't test it, but the code looks good to me