Adding pgCompare to PGBelt

[eldabaa]

Introducing the Compare command, which utilizes the pg-compare tool designed to complement database migrations. This tool enables seamless comparison of your PostgreSQL database schemas, ensuring that your migrations are accurate and efficient. With the Compare command, you can easily identify discrepancies between different versions of your database, facilitating smoother and more reliable migration processes.

[github-actions]

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1 out of 2 committers have signed the CLA.
✅ (eldabaa)[https://github.com/eldabaa]
❌ @gtmanfred
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[eldabaa]

I have read the CLA Document and I hereby sign the CLA