Ability to Block and Report Spam

[kpd328]

It would be nice to have a command to invoke the "Block & Report Spam" option of Google Messages through the bridge.

I believe blocking and reporting can each be invoked individually, though it's the same button in the native app, so it might be the same endpoint anyways.

When a contact is blocked and the messages archived on Google Messages the bridge already deletes the portal for that conversation, so it seems to me like the only thing that would need to be added is a way to block the contact from within the portal itself.