feat: expose api to run initialization scripts on all frames.

[Simon-Laux]

I need this to disable webrtc in all frames.

try {
window.RTCPeerConnection = ()=>{};
RTCPeerConnection = ()=>{};
} catch (e){console.error("failed to overwrite RTCPeerConnection apis",e)}
try {
    window.webkitRTCPeerConnection = ()=>{};
    webkitRTCPeerConnection = ()=>{};
} catch (e){}

Currently the init script only runs on the main script despite the documentation telling otherwise:

/// Since it runs on all top-level document navigastions (and also child frame page navigations
/// ...
pub fn initialization_script(mut self, script: &str) -> Self {

This pr exposes the argument (run_only_on_main_frame) whether to run in all frames or only on the main frame.

• add API to run initialisation scripts on all frames
  • WebviewBuilder::initialization_script_on_all_frames
  • WebviewWindowBuilder::initialization_script_on_all_frames
  • WebviewAttributes::initialization_script_on_all_frames

Progress

• If this change requires a new version, then add a change file in .changes directory with the appropriate bump, see https://github.com/tauri-apps/tauri/blob/dev/.changes/README.md
• Ensure that all your commits are signed https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits
• Ensure cargo test and cargo clippy passes.

[github-actions]

Package Changes Through a846962

There are 2 changes which include tauri with minor, tauri-runtime with minor

Planned Package Versions

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

package	current	next
tauri-runtime	2.5.1	2.6.0
tauri-runtime-wry	2.5.1	2.5.2
tauri	2.4.1	2.5.0

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[amrbashir]

there is also #11971 , I am fine to go with any just as long as it is not breaking change.

[Simon-Laux]

I removed the breaking change making a new api instead. I named it initialization_script_on_all_frames because IMO the initialization_script_for_main_only name from the webkit api is very confusing.
But in the end I'm fine with either this pr or #11971 getting merged, most important is that the feature is accessible.

[Legend-Master]

Look good to me, just wait for lucas to confirm if it's ok to modify WebviewAttributes

[Legend-Master]

Thanks for the patience 🙃