Tool registry

[kylecorry31]

A way to add new tools without all the boilerplate.

• [x] Register tool (shows up in tools list)
• [x] Register quick action (available everywhere)
• [x] Register guide
• [x] Register quick setting tile
• [x] Register settings
• [x] Register volume shortcut (can be used to prevent volume actions while on the tool)
• [x] Register background service (for the battery tool)
• [x] Register notification channels
• [ ] Register diagnostics

This should also more easily allow me to move tools to a separate module or load a plugin in the future.

The initial implementation of this can just be a configuration object, but in the future it can be decoupled.