Add GHIssue#queryComments, with a since() filter

[yrodiere]

Description

Relevant documentation: https://docs.github.com/en/rest/issues/comments#list-issue-comments

This particular endpoint was already exposed through listComments, but that method doesn't allow setting the since filter, which filters out comments last created/updated before a given date.

I fixed that by introducing a new queryComments method that works similarly to org.kohsuke.github.GHRepository#queryIssues, though it exposes only one filter (the only one available at the moment): since.

Before submitting a PR:

• [X] Changes must not break binary backwards compatibility. If you are unclear on how to make the change you think is needed while maintaining backward compatibility, CONTRIBUTING.md for details.
• [X] Add JavaDocs and other comments as appropriate. Consider including links in comments to relevant documentation on https://docs.github.com/en/rest .
• [X] Add tests that cover any added or changed code. This generally requires capturing snapshot test data. See CONTRIBUTING.md for details.
• [X] Run mvn -D enable-ci clean install site locally. If this command doesn't succeed, your change will not pass CI.
• [X] Push your changes to a branch other than main. You will create your PR from that branch.

When creating a PR:

• [X] Fill in the "Description" above with clear summary of the changes. This includes:
  • [X] If this PR fixes one or more issues, include "Fixes #" lines for each issue.
  • [X] Provide links to relevant documentation on https://docs.github.com/en/rest where possible.
• [X] All lines of new code should be covered by tests as reported by code coverage. Any lines that are not covered must have PR comments explaining why they cannot be covered. For example, "Reaching this particular exception is hard and is not a particular common scenario."
• [x] Enable "Allow edits from maintainers".

[codecov[bot]]

Codecov Report

Base: 78.95% // Head: 78.98% // Increases project coverage by +0.02% :tada:

Coverage data is based on head (a628b93) compared to base (319e943). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1524      +/-   ##
============================================
+ Coverage     78.95%   78.98%   +0.02%     
- Complexity     2129     2134       +5     
============================================
  Files           204      205       +1     
  Lines          6463     6472       +9     
  Branches        362      362              
============================================
+ Hits           5103     5112       +9     
  Misses         1148     1148              
  Partials        212      212              

Impacted Files	Coverage Δ
src/main/java/org/kohsuke/github/GHIssue.java	74.05% <100.00%> (+0.16%)	:arrow_up:
...org/kohsuke/github/GHIssueCommentQueryBuilder.java	100.00% <100.00%> (ø)

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