Add support of review_requested event

[t0m4uk1991]

Description

Add support of review_requested issue event

Will close #1198

[t0m4uk1991]

Hi @bitwiseman
During test data generation I constantly get "{"message": "Must have admin rights to Repository.", "documentation_url": "https://docs.github.com/rest/reference/pulls#request-reviewers-for-a-pull-request"}".

Can someone with admin rights to hub4j-test-org/github-api generate the test data for this PR?

[bitwiseman]

@t0m4uk1991 I've invited you to the hub4j-test-org. You can then record the data.

[codecov]

Codecov Report

Merging #1199 (6428f33) into main (7a4af15) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #1199   +/-   ##
=========================================
  Coverage     74.25%   74.26%           
- Complexity     1880     1882    +2     
=========================================
  Files           188      188           
  Lines          6200     6202    +2     
  Branches        368      368           
=========================================
+ Hits           4604     4606    +2     
  Misses         1374     1374           
  Partials        222      222           

Impacted Files	Coverage Δ
src/main/java/org/kohsuke/github/GHIssueEvent.java	59.25% <100.00%> (+3.25%)	⬆️

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[bitwiseman]

Great!