feat: region aware adapter

[filipecabaco]

What kind of change does this PR introduce?

Ecto Adapter that is region aware so we can write to master only on selected regions.

[blacksmith-sh]

Found 16 test failures on Blacksmith runners:

Failures

Test	View Logs
test handle aws platform handles ap-southeast-1 region (Realtime.Repo.ReplicaTest)	View Logs
test handle aws platform handles ap-southeast-2 region (Realtime.Repo.ReplicaTest)	View Logs
test handle aws platform handles eu-west-2 region (Realtime.Repo.ReplicaTest)	View Logs
test handle aws platform handles us-east-1 region (Realtime.Repo.ReplicaTest)	View Logs
test handle aws platform handles us-west-1 region (Realtime.Repo.ReplicaTest)	View Logs
test handle aws platform handles us-west-2 region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles fra region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles gru region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles iad region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles lhr region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles maa region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles sea region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles sin region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles sjc region (Realtime.Repo.ReplicaTest)	View Logs
test handle fly platform handles syd region (Realtime.Repo.ReplicaTest)	View Logs
test message ID metadata includes message ID in metadata when provided (Realtime.Tenant s.BatchBroadcastTest)	View Logs

[coveralls]

coverage: 86.042% (-0.9%) from 86.989%
when pulling 1cc94a7 on feat/repo-master-region-aware
into 37ff451 on main.