feat(ingestion/sql-common): add column level lineage for external tables

[acrylJonny]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[hsheth2]

Now that #12220 has been merged, we can make this implementation be a bit cleaner.

[codecov]

Codecov Report

Attention: Patch coverage is 72.00000% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ion/src/datahub/ingestion/source/sql/sql_common.py	70.83%	7 Missing ⚠️

❌ Your patch check has failed because the patch coverage (72.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

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[acrylJonny]

Now that #12220 has been merged, we can make this implementation be a bit cleaner.

Now refactored to align with updates in #12220