Make TLS and Authorization Configuration Fields Optional

[yorozunouchu]

This pull request fixes #565 where the TLSNotary server fails to start when specific configuration fields (private_key_pem_path, certificate_pem_path, and whitelist_csv_path) are missing, even when the corresponding features are disabled.

Please review and provide feedback!

[yuroitaki]

Thanks for the PR guys! Few comments, and also

• base your PR on dev instead of main
• remember to follow the guideline here

[yuroitaki]

Remember to base your PR on dev instead of main~

[codecov]

Codecov Report

Attention: Patch coverage is 87.09677% with 4 lines in your changes missing coverage. Please review.

Project coverage is 55.43%. Comparing base (c10c915) to head (9662f70).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
crates/notary/server/src/server.rs	87.09%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #589   +/-   ##
=======================================
  Coverage   55.43%   55.43%           
=======================================
  Files         193      193           
  Lines       20842    20853   +11     
=======================================
+ Hits        11553    11560    +7     
- Misses       9289     9293    +4     

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[yuroitaki]

@yorozunouchu the CI fails because of clippy and formatting; can you guys follow the guidelines here https://github.com/tlsnotary/tlsn/blob/dev/CONTRIBUTING.md#linting and https://github.com/tlsnotary/tlsn/blob/dev/CONTRIBUTING.md#style

[yuroitaki]

Amazing work, thanks so much again @yorozunouchu and @funkyenough !