This does a *lot* of things. Essentially, it replaces the existing
individual proxy- and autoproxy caches on the bot end with a
global cache (in Core) that handles all the caching at once, and
automatically invalidates the cache once something changes in the
datastore.
This allows us to do proxying and autoproxying with *zero database
queries* (best-case).
This also refactors a large portion of the DI toolchain, since
I discovered that you shouldn't be reusing IDbConnection objects.
Instead, most services and stores are now declared transient, and
the webhook cache has been moved to a database-independent storage
singleton by itself.
