Refactor pagination

[bitwiseman]

Description

Before submitting a PR:

• 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.
• Add JavaDocs and other comments explaining the behavior.
• When adding or updating methods that fetch entities, add @link JavaDoc entries to the relevant documentation on https://docs.github.com/en/rest .
• Add tests that cover any added or changed code. This generally requires capturing snapshot test data. See CONTRIBUTING.md for details.
• Run mvn -D enable-ci clean install site "-Dsurefire.argLine=--add-opens java.base/java.net=ALL-UNNAMED" locally. If this command doesn't succeed, your change will not pass CI.
• Push your changes to a branch other than main. You will create your PR from that branch.

When creating a PR:

• Fill in the "Description" above with clear summary of the changes. This includes:
  • If this PR fixes one or more issues, include "Fixes #" lines for each issue.
  • Provide links to relevant documentation on https://docs.github.com/en/rest where possible. If not including links, explain why not.
• 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."
• Enable "Allow edits from maintainers".

[codecov]

Codecov Report

❌ Patch coverage is 93.42105% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.01%. Comparing base (3745013) to head (87677f3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ava/org/kohsuke/github/PaginatedEndpointItems.java	75.86%	4 Missing and 3 partials ⚠️
...ain/java/org/kohsuke/github/PaginatedEndpoint.java	94.54%	2 Missing and 1 partial ⚠️
.../java/org/kohsuke/github/GHCommitFileIterable.java	71.42%	1 Missing and 1 partial ⚠️
...java/org/kohsuke/github/GHCommitSearchBuilder.java	87.50%	1 Missing ⚠️
...n/java/org/kohsuke/github/PagedSearchIterable.java	75.00%	1 Missing ⚠️
...ava/org/kohsuke/github/PaginatedEndpointPages.java	97.43%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2099      +/-   ##
============================================
- Coverage     85.02%   85.01%   -0.01%     
- Complexity     2495     2501       +6     
============================================
  Files           237      232       -5     
  Lines          7351     7283      -68     
  Branches        388      372      -16     
============================================
- Hits           6250     6192      -58     
+ Misses          871      868       -3     
+ Partials        230      223       -7     

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