532 fixing behaviour with alias

[AnirudhVIyer]

Describe your changes

Modified the set method in the Connection Class such that: if a connection with a descriptor exists, we check it's alias with the new alias argument.

Issue number

Closes #532

Checklist before requesting a review

• Performed a self-review of my code
• Formatted my code with pkgmt format
• Added tests (when necessary).
• Added docstring documentation and update the changelog (when needed)

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📚 Documentation preview 📚: https://jupysql--599.org.readthedocs.build/en/599/