Add message committer module for SQL

[maestre3d]

In event-driven systems, idempotency is the way to guarantee exactly-once processing. This kind of processing is highly required for any system to comply with data consistency.

A way to avoid duplicates to be processed, is to create a table inside our persistence store (in this case, SQL) and track messages processed by the given system (e.g. re-processing a specific message).

Nevertheless, there are other options that do not incur on the previously mentioned solution. For example, a complete implementation of CDC properties tackles this problem by in-transit message unit mutation instead an overall infrastructure enhancement.