Add PostgreSQLQueue and DelayedPostgreSQL Pub/Sub

[m110]

• Added PostgreSQLQueueSchema and PostgreSQLQueueOffsetsAdapter.
  • This schema is similar to the original one, except it allows filtering messages with a custom WHERE clause.
  • It doesn't support customer groups.
  • It allows deleting messages from the table after acking (optional).
• Added NewDelayedPostgreSQLPublisher and NewDelayedPostgresSQLSubscriber
  • They work on top of the conditional schema and use the delay component implemented in Requeuer and Message Delay watermill#469
  • The idea is to receive messages with a delay or at a given time in a simple way.
• Reworked the SchemaAdapter and OffsetsAdapter interfaces (Breaking change -> will bump the major to v4).
  • We had a few instances where some details have been missing from one of the interface methods. It makes it difficult to extend this library with new features, as each will require a major version bump, and we want to avoid it if possible.
  • To mitigate this, we're moving to a params struct passed to the methods instead of raw arguments. It adds some verbosity but allows extending the params if needed with no breaking changes to the library.
  • The methods now also return errors.
  • Migration: if you don't use a custom schema/offsets adapter, you don't need to do anything. If you do, change the methods to implement the new interfaces. Use values from the params argument and return errors.