Add producer_config key to kafka journal writer
This allows us to override producer settings such as message.max.bytes
Test Plan
tests updated + running in production
Migrated from D2493 (view on Phabricator)
Staging instance, all changes can be removed at any time
This allows us to override producer settings such as message.max.bytes
tests updated + running in production
Migrated from D2493 (view on Phabricator)