AddonsManagerAdapter

This allows consumers to ensure that underlying database connections are fully established.
After `warmUp` is called, there should be no additional overhead upon first access to the storage.

an add-on

We're caching the `fxaPushScope` in memory and also saving it to our
prefs. When we log out, we delete the pref, but the in-memory isn't
removed.

We could always fetch from the prefs instead of using an in-memory
caching, however this could be a bit expensive to always read from prefs
since we need to do this check when receiving any push message.

An easier solution would be to never remove the scope in prefs once
generated. It is safe to persist the push scope across different
accounts since the combination of scope + UAID is unique per install.

of displaying it (ex: three-dot menu can now hide the notification dot
for some items)

This allows us to initialize objects which depend on these delegates without having
to block on instantiating storage components themselves.

permission is not allowed first

I also updated the tests accordingly.
Made this change because the tracking protection icon is not updated after the
exceptions are removed.

become available