feat: expose wry permission handler API in tauri

[F0RLE]

Summary

This PR exposes the wry permission handler API through Tauri's public interface, enabling applications to programmatically handle permission requests from the webview.

Motivation

Currently, certain web APIs like getDisplayMedia() on Linux (via WebKitGTK) fail because they require an explicit permission grant that cannot be handled by the default webview behavior. This results in "NotAllowedError" or "Screen sharing was cancelled" errors.

By exposing on_permission_request, developers can intercept these requests and provide the necessary Allow or Deny response programmatically. This is essential for building screen sharing, video conferencing, and other permission-sensitive features in Tauri apps.

Changes

• tauri-runtime: Added PermissionKind (mirroring wry) and PermissionResponse enums. Added DisplayCapture to support screen sharing.
• tauri-runtime-wry: Implemented the permission handler integration in create_webview, mapping runtime types to wry types.
• tauri: Added on_permission_request method to WebviewBuilder and WebviewWindowBuilder as a public API.

Dependencies

This PR depends on the changes in tauri-apps/wry#1654.

Example Usage

tauri::WebviewWindowBuilder::new(app, "main", tauri::WebviewUrl::App("index.html".into()))
  .on_permission_request(|_webview, kind| {
    match kind {
      tauri::webview::PermissionKind::DisplayCapture => tauri::webview::PermissionResponse::Allow,
      tauri::webview::PermissionKind::Microphone => tauri::webview::PermissionResponse::Allow,
      _ => tauri::webview::PermissionResponse::Default,
    }
  })
  .build()?;

[github-actions]

Package Changes Through 5662578

There are 9 changes which include tauri with minor, @tauri-apps/cli with minor, tauri-cli with minor, tauri-utils with patch, tauri-build with patch, tauri-macos-sign with patch, tauri-bundler with minor, tauri-runtime-wry 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-utils	2.8.1	2.8.2
tauri-macos-sign	2.3.2	2.3.3
tauri-bundler	2.7.5	2.8.0
tauri-runtime	2.9.2	2.10.0
tauri-runtime-wry	2.9.3	2.10.0
tauri-codegen	2.5.2	2.5.3
tauri-macros	2.5.2	2.5.3
tauri-plugin	2.5.2	2.5.3
tauri-build	2.5.3	2.5.4
tauri	2.9.5	2.10.0
@tauri-apps/cli	2.9.6	2.10.0
tauri-cli	2.9.6	2.10.0

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[F0RLE]

This PR depends on tauri-apps/wry#1654. CI will fail until that PR is merged and a new wry version is released.