Adds percona server for postgresql support

[agriev]

Describe your changes:

Fixes issue with inability to collect metadata from percona for postgresql server

discussed here: slack thread

The only meaningful difference between vanilla postgreSQL and Percona is version string in percona server for postgresql. So commit propose universal and safe way to detect server version by integer string and not complicated parsing of unformatted string.

tested on both postgresql and percona instances, fix is not affecting anything except version check logic in this particular scenario, works the same for vanilla postgreSQL

I worked on it because we need it in out infrastructure and we are using it everyday

Type of change:

• Improvement

Checklist:

• I have read the CONTRIBUTING document.
• My PR title is Fixes <issue-number>: <short explanation>
• I have commented on my code, particularly in hard-to-understand areas.
• For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

Improvement - no changes in tests and docs necessary

• I have added tests around the new logic.
• For connector/ingestion changes: I updated the documentation.

[github-actions]

Hi there 👋 Thanks for your contribution!

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