Feature: Remove FullTrust handlers

We are migrating to WindowsAppSDK, thus there’s no longer need for fulltrust process for interop. This will bring performance improvements since the overhead of (de)serialization and IPC can be avoided.

While removing handlers, note that we no longer need (de)serialization, so we should also remove all serialization code and use the underlying data directly. For example, base64-byte[].

Using this issue for tracking work-items of fulltrust handlers removal.

Requirements

• remove these handlers
• ApplicationLaunchHandler
• ContextMenuHandler
• DesktopWallpaperHandler
• DriveHandler
• FileOperationsHandler
• FileTagsHandler
• IMessageHandler
• InstallOperationsHandler
• LibrariesHandler (assigned to @itsWindows11)
• NetworkDrivesHandler
• QuickLookHandler
• RecentItemsHandler
  • Watchers
  • Others
• RecycleBinHandler (assigned to @lukeblevins)
  • Watchers
  • Others
• Win32MessageHandler
  • Watchers
  • Others

[lukeblevins]

I’m almost done with the DriveHandler, so that one shouldn’t be assigned to anyone else. @yaichenbaum

[lukeblevins]

@hez2010 I can take care of removing RecentItemsHandler once #9857 is merged because we’d want to have baked in support for a number of service implementations capable of listing/aggregating recent items from a multitude of sources down the road.

@yaichenbaum FYI