Add authentication for local

[aniketmaurya]

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 can authenticate locally without providing API keys.

• If lightning cli logged in: we fetch the keys automatically
• if non-lightning user: we open the browser for sign up

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.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73%. Comparing base (701483f) to head (84aaa01).
Report is 1 commits behind head on main.

Additional details and impacted files

@@        Coverage Diff         @@
##           main    #3   +/-   ##
==================================
+ Coverage    73%   73%   +1%     
==================================
  Files         6     6           
  Lines       282   298   +16     
==================================
+ Hits        205   219   +14     
- Misses       77    79    +2     

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