feat(webview2): add option to disable browser-level autofill on Windows

[aoxiangtianyu-go]

Summary

Add an application-level option to control browser-level autofill and form suggestions on Windows (WebView2), based on existing support in wry.

Motivation

User reports indicate that:

• autocomplete="off" is not reliably respected on Windows WebView2
• WebView2 "Suggestions" may still display autofill UI

Exposing this option allows applications to explicitly control this behavior.

Related issues:

• Expose IsGeneralAutofillEnabled WebView2 setting wry#1535
• Clear saved info clash-verge-rev/clash-verge-rev#5944

Testing

• JavaScript API tested locally with a minimal Tauri application

Known Limitation

• cargo test does not pass locally due to a known issue: [bug] Fresh clone: cargo test fails on Windows #14719 [bug] Follow-up: cargo test still fails on Windows #14723
• Based on code inspection and local runtime testing, this change is not expected to introduce new issues.

Notes

• Two version-related values in the code are pending confirmation and will be updated.
  • API @since annotation 1
  • API @since annotation 2

Status

• This PR is submitted as Draft, the implementation itself is ready for review.
• Depends on upstream: enhance: Add an option to control browser-level autofill behavior on Windows wry#1649
• If the upstream PR is not merged, this PR will be proactively closed