v1 fixes: OAuth functionality - part I

[FeodorFitsner]

Summary by Sourcery

Refactor OAuth functionality to be fully asynchronous, removing synchronous methods and simplifying the API. Improve event handling and update related components.

Bug Fixes:

• Correct OAuth callback handling in FletOAuth to invoke the method on the page instance.
• Ensure did_mount is called for controls added via Session.get_page_patch.
• Add error handling for missing control IDs in Session.handle_invoke_method_results.

Enhancements:

• Remove synchronous OAuth methods (login, request_token, _fetch_user, _fetch_groups, etc.) across Page, Authorization, and providers.
• Refactor asynchronous OAuth methods (login_async, request_token_async, etc.) to use httpx.AsyncClient directly.
• Simplify OAuth authorization flow initiation in Page.login_async.
• Improve event dispatch handling in various connection types using asyncio.create_task.
• Update Page.run_task and Page.run_thread to use the connection event loop.
• Refactor internal Page update methods related to mount/unmount handling.

Build:

• Update dependencies in poetry.lock.

Chores:

• Remove debug print statement from Dart SharedPreferencesService.