fix: Fix the int vs long issue in IssueClient methods

[Abhi347]

Creates overloaded methods for both int and long ids in IssueClient and marks int ids as deprecated.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 77.42%. Comparing base (07a7513) to head (6cb031c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ava/com/spotify/github/v3/clients/IssueClient.java	66.66%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #222      +/-   ##
============================================
- Coverage     77.46%   77.42%   -0.05%     
- Complexity      417      421       +4     
============================================
  Files            60       60              
  Lines          1367     1373       +6     
  Branches         59       59              
============================================
+ Hits           1059     1063       +4     
- Misses          265      267       +2     
  Partials         43       43              

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