Feat/strings count anagrams

[BrianLusina]

Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: dc60557c-1746-441e-b3a5-fc4d83f12b23

📥 Commits

Reviewing files that changed from the base of the PR and between ad930f7 and bd1fd1e.

⛔ Files ignored due to path filters (2)

• pystrings/anagram/count_anagrams/images/solutions/count_anagrams_illustration_1.png is excluded by !**/*.png
• pystrings/anagram/count_anagrams/images/solutions/count_anagrams_illustration_2.png is excluded by !**/*.png

📒 Files selected for processing (4)

• DIRECTORY.md
• pystrings/anagram/count_anagrams/README.md
• pystrings/anagram/count_anagrams/__init__.py
• pystrings/anagram/count_anagrams/test_count_anagrams.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/strings-count-anagrams

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