feat: api for subject related characters & persons

[everpcpc]

#50
#52

[codecov]

Codecov Report

Attention: Patch coverage is 92.82297% with 15 lines in your changes missing coverage. Please review.

Project coverage is 69.87%. Comparing base (75784e9) to head (2e3ff76).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
routes/private/routes/subject.ts	93.45%	11 Missing ⚠️
lib/types/fetcher.ts	80.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #788      +/-   ##
==========================================
+ Coverage   69.49%   69.87%   +0.38%     
==========================================
  Files          96       96              
  Lines       14962    15149     +187     
  Branches      740      753      +13     
==========================================
+ Hits        10398    10586     +188     
+ Misses       4555     4554       -1     
  Partials        9        9              

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