Deprecate PowerSync.Maui, expand PowerSync.Common's supported runtimes

[LucDeCaf]

This PR folds PowerSync.Maui's functionality into PowerSync.Common, making PSMaui obsolete.

PSMaui bundles mobile builds of the PS SQLite Core extension with its nupkg. It also overrides LoadPowerSyncExtension to include logic for loading the extension on mobile platforms.

This PR moves that logic to be in PSCommon by default.

Migration

1. Replace any instances of PowerSync.Maui.SQLite.MAUISQLiteDBOpenFactory with PowerSync.Common.MDSQLite.MDSQLiteDBOpenFactory.

2. Replace any instances of PowerSync.Maui.SQLite.MAUISQLiteAdapter with PowerSync.Common.MDSQLite.MDSQLiteAdapter.

3. Remove any references to PowerSync.Maui and remove from your .csproj file.

Considerations

• For purely desktop targeting apps (net8.0;net9.0;net10.0), this PR technically just adds package bloat, however the extra runtimes are not included in the final app bundle.
• I'm not sure how adding more native libraries will impact future attempts to target more esoteric platforms like Unity or Blazor; I plan to make a small Unity POC to check for potential concerns.

Other Changes

• The ios and maccatalyst .xcframeworks are unzipped, stripped of unneeded platforms, and rezipped before bundling. The bundle size savings from this are alone enough to offset the size costs of including all platforms in PSCommon for mobile targeting apps.
• .xcframework files are now shipped as .xcframework.zip, since Apple is still able to work with them in that format.

AI Usage

I had a long conversation with Claude which ultimately led to me brute forcing my way into the current approach of unconditional runtimes/* downloading with conditional per-target runtimes/<rid> inclusion. I also asked it to handle stripping the additional platforms from the .xcframework files. I reviewed everything myself and tested using the MAUITodo demo on iOS and Android and the CommandLine demo on macOS. I will test on a physical iOS and Android device before publishing.