feat: add /players/me endpoint (#191)

[emonadeo]

Add /players/me that returns the FullPlayer linked to the authenticated user.
Returns 401 if unauthenticated (duh).
Returns 404 if no claim exists.

Closes #191.

License Acceptance

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.76%. Comparing base (3d095e4) to head (f7d5839).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #197      +/-   ##
==========================================
+ Coverage   29.31%   29.76%   +0.45%     
==========================================
  Files         117      117              
  Lines        8321     8334      +13     
==========================================
+ Hits         2439     2481      +42     
+ Misses       5882     5853      -29     

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[stadust]

Thanks! Love this solution :)