feat: add back/forward navigation APIs (fix #1735)

[Buncys]

Summary

This PR adds back/forward navigation APIs and navigation state queries, as requested in #1735.

The following APIs were added:

• go_back()
• go_forward()
• can_go_back() -> bool
• can_go_forward() -> bool

Implementation

• Windows (WebView2) GoBack / GoForward / CanGoBack / CanGoForward
• macOS / iOS (WKWebView) goBack / goForward / canGoBack / canGoForward
• Linux (WebKitGTK) go_back / go_forward / can_go_back / can_go_forward
• Android goBack / goForward / canGoBack / canGoForward through JNI

Fixes #1735

[github-actions]

Package Changes Through 09641e9

There are 1 changes which include wry 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
wry	0.55.1	0.56.0

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