Move Token Import From a Pickle File Import to a Simple Text File

[bbulpett]

What was done

---

Addressing issue #21

• Updated the code in parse_review_issues.py to import a txt file and populate the API_TOKEN variable rather than using a pickle.
• Created a small helper function in the pyosmet src/file_io.py to import the parse the text file.
• Updated the code in all three scripts as well to use the txt file rather than the pickle file
  -- parse_review_issues.py
  -- parse-contributors.py
  -- update_reviewers.py
• Updated the .gitignore file to ensure the txt file is never populated into git history
• Updated README.md with instructions in creating the token and storing it for use.

How to test

---

• Run the workflow (particularly parse_review_issues.py) and review the output file (package.yml).
• Ensure that no error is encountered related to the token or token file.

...

Special thanks to the team at PyCon 2023 for making this possible, with their help and encouragement! Thank you especially to @lwasser.

[bbulpett]

pre-commit.ci autofix

[lwasser]

this pr looks great!! thank you @bbulpett !! checking it out now locally and then will merge!

[lwasser]

This looks great!! merging now!