Add adapter kpostgres

[VinGarcia]

This is a minor release that adds a new adapter kpostgres, this adapter is only meant to be used if you are using a framework that forces you to connect to Postgres over a database/sql.DB instance.

More specifically this addition was made with help from @devalexandre for integrating KSQL with the encore framework.

In any case, if you have the choice you should always use kpgx over kpostgres since the former is much more efficient.

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This discussion was created from the release Add adapter kpostgres.