feat(core): add a new function to set theme dynamically

[Legend-Master]

Closes #5279

Waiting for https://github.com/tauri-apps/tao/pull/937

[github-actions[bot]]

Package Changes Through bb57d27741c193ec1bf1bda4daf979be9a49f729

There are 8 changes which include tauri with prerelease, tauri-runtime-wry with prerelease, tauri-runtime with prerelease, tauri-utils with prerelease, @tauri-apps/api with prerelease, tauri-cli with prerelease, @tauri-apps/cli with prerelease, tauri-bundler 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]

I need to get some sleep, will get back to this tomorrow

[wyhaya]

Will the set_theme API be ported to Tauri 1x? It is still very difficult to dynamically change the theme for Tauri 1x, especially on Windows, as we cannot access the Webview instance.

[FabianLars]

We typically don't backport features this large ourselves but we'll look at community prs doing so. The changes, especially in Tao are not that trivial so i doubt this would be worth it.

p.s. what's the reason you stay with v1?