MOBILEWEBVIEW-3: Add mindbox webview

[enotniy]

https://tracker.yandex.ru/MOBILEWEBVIEW-3

[Copilot]

Pull request overview

This PR refactors the WebView in-app message implementation by introducing a WebViewController abstraction layer to replace direct WebView usage. The changes improve maintainability by separating platform-specific WebView logic from the business logic and add support for reattaching in-app messages when restoring activity state.

Changes:

• Refactored WebViewInAppViewHolder to use WebViewController instead of direct WebView manipulation
• Introduced WebViewJsBridge interface to replace the deleted WebAppInterface class
• Added reattachment support for in-app messages through new reattach and canReuseOnRestore methods

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
WebViewInappViewHolder.kt	Refactored to use WebViewController abstraction, replacing direct WebView manipulation with controller methods, and added reattachment logic
WebAppInterface.kt	Deleted file - functionality moved to WebViewJsBridge interface
InAppViewHolder.kt	Added reattach and canReuseOnRestore interface methods with default implementations
AbstractInAppViewHolder.kt	Extracted common view attachment logic and implemented reattach method
InAppMessageViewDisplayerImpl.kt	Added logic to restore and reattach previously paused in-app holders
kmp-common-sdk	Updated subproject commit reference

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