manage mutagen daemon lifecycle for coder-desktop-windows

[spikecurtis]

Daemon Lifecycle

• We’ll embed the daemon in Coder Desktop as described in the [mutagen docs.](https://mutagen.io/documentation/introduction/daemon/)
  • We’ll use a data directory under the main Coder Desktop data directory to ensure our instance of mutagen doesn’t interfere with other instances on the system (i.e. directly installed by the end user).
• We’ll use Mutagen’s existing autostart capability if possible, and avoid implementing our own autostart.
  • Technical risk: Support is listed as experimental. If we find problems we should be prepared to roll our own lifecycle management.
  • call mutagen daemon register when first file sync is created
  • call mutagen daemon unregister when last file sync is deleted, or file sync disabled entirely.

[ethanndickson]

Crossposting for posterity: #381 (comment)