feat: support auto completion of models

[k223kim]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Users will have autocompletion for the models that Lightning supports.

Demo: https://www.loom.com/share/b11ef9a82196458094c80c85de7911c3?sid=6a3c8101-6b6e-4233-87c0-a2cbf24923a7

Screenshot:

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

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[codecov]

Codecov Report

❌ Patch coverage is 30.30303% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 84%. Comparing base (472143a) to head (1644ef5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@        Coverage Diff         @@
##           main   #41   +/-   ##
==================================
- Coverage    89%   84%   -4%     
==================================
  Files         6     8    +2     
  Lines       400   432   +32     
==================================
+ Hits        355   364    +9     
- Misses       45    68   +23     

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