feat(#174): arc github lock

[h1alexbel]

In this pull I've fixed bug with broken user registration via Arc<Mutex<GitHub>>, introduced new tests to catch this problem in the future.

closes #174
History:

• feat(can't register user #174): works
• feat(can't register user #174): enable tests
• feat(can't register user #174): enable repo tests
• feat(can't register user #174): enable fakehub tests
• feat(can't register user #174): enable doc tests
• feat(can't register user #174): clean for check
• feat(can't register user #174): test
• feat(can't register user #174): registers_with_extra_fields

---

PR-Codex overview

This PR focuses on enhancing thread safety in the FakeHub structure by using Arc<Mutex<GitHub>>, ensuring concurrent access is managed properly. Additionally, it refactors various functions and updates user handling to improve reliability and maintainability.

Detailed summary

• Changed github in FakeHub to Arc<Mutex<GitHub>> for thread safety.
• Updated main() method to return Arc<Mutex<GitHub>>.
• Refactored user handling in multiple handlers to lock the GitHub instance before accessing users.
• Modified Coordinates struct to hold a reference to FakeHub.
• Adjusted method signatures to accept references where appropriate.
• Enhanced tests to validate user registration and properties.

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[l3r8yJ]

@h1alexbel can we wait this pr before merging this one?

[codecov]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.13%. Comparing base (c471234) to head (598e66d).
Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
server/src/handlers/register_user.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
- Coverage   83.15%   82.13%   -1.03%     
==========================================
  Files          16       16              
  Lines         285      291       +6     
==========================================
+ Hits          237      239       +2     
- Misses         48       52       +4     

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[h1alexbel]

@l3r8yJ I think yes, if it would be fast to merge types PR

[h1alexbel]

@l3r8yJ take a look, please

[h1alexbel]

@l3r8yJ take a look, please

[h1alexbel]

@l3r8yJ take a look, please

[0crat]

@h1alexbel Hey there, awesome work on your contribution! 👍 You've earned +4 points, which breaks down like this: +4 base points, +6 for your 139 hits-of-code (nice job!), but -16 because there wasn't a code review (oops!). We bumped it up by +9 to keep you motivated. Your total balance is now +63. Remember, code reviews are super important - they can boost your points and improve code quality. Keep the contributions coming and aim for that sweet spot of 200-800 hits-of-code for max points! Keep up the great work!