feat(cdc): read from multiple tables

[raulb]

Description

Part of ConduitIO/conduit#1473

• Update source configuration to read from opencdc.collection instead of from postgres.table in logrepl.cdc.
• Implement wildcard functionality to listen to all tables (*)
• Update readme for both source and destination (part of Multiple collections support in the destination #131)

Quick checks:

• I have followed the Code Guidelines.
• There is no other pull request for the same update/change.
• I have written unit tests.
• I have made sure that the PR is of reasonable size and can be easily reviewed.