feat(#154): ghmentions

[h1alexbel]

In this pull I've added ghmentions script for collecting GitHub pull request and GitHub issue mentions in README file.

closes #154
History:

• feat(imentions, pmentions in the entire repo #154): start
• feat(imentions, pmentions in the entire repo #154): works
• feat(imentions, pmentions in the entire repo #154): tests
• feat(imentions, pmentions in the entire repo #154): csv test case
• feat(imentions, pmentions in the entire repo #154): collect ghmentions

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PR-Codex overview

This PR introduces functionality to count GitHub pull request and issue mentions in README files, enhancing the data processing capabilities of the project. It adds new fields, modifies tests, and includes a new script for handling these mentions.

Detailed summary

• Added readme_pmentions and readme_imentions to final.py.
• Introduced gh_mentions.py to count GitHub mentions.
• Updated test cases in test_final.py and test_ghmentions.py.
• Modified pyproject.toml for new tasks.
• Updated CSV resources for new fields.

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[h1alexbel]

@rultor merge

[rultor]

@rultor merge

@h1alexbel OK, I'll try to merge now. You can check the progress of the merge here.

[rultor]

@rultor merge

@h1alexbel Done! FYI, the full log is here (took me 13min).