Introducing a new build farm module, ABICompCheck,

designed to perform Application Binary Interface (ABI) compliance checking
for PostgreSQL builds using libabigail tools abidiff and abidw.

The module helps detect unintended ABI changes in stable branches
by comparing the latest commit against the most recent tag on that branch.
This is crucial for maintaining compatibility
for the PostgreSQL ABI stability guidelines for minor releases.

Author: MankiratSingh1315