dig.X functionality added for PTR lookups by IP, with unit test

[matthewsaum]

What does this PR do?

Adding "dig.X" functionality to dig execution module

What issues does this PR fix or reference?

Fixes:
#62275

Previous Behavior

Remove this section if not relevant
dig.X: module errors out due to function not existing

New Behavior

dig.X now can resolve IPs to their PTR records

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

No
New to this, hadn't configured that yet. I'll read into it and figure it out next.

Please review Salt's Contributing Guide for best practices.

See GitHub's page on GPG signing for more information about signing commits with GPG.

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