chore: add spell check

[erika-wallace]

Description

Work Item

This pull request adds a job to the Tests workflow and a Git pre-commit hook to the CLI repository, both dedicated to spell checking modified files. The spell checker will generate a list of any misspelled words it detects, including the file and line number. Also, there's a custom-dictionary.txt file that should be updated with words, variables, package names, etc. that are flagged by the spell checker but are not actually misspelled.

The spell-check job in the Tests workflow will fail if any spelling errors are detected, and the Git pre-commit hook will block the commit. To bypass the Git pre-commit hook and commit changes without running the spell check, use the -n flag.

Testing

1. create a new branch based on this branch
2. run yarn
3. create a test file and add misspellings within it
4. attempt to commit your changes
   NOTE: There should be a Git error when you try to commit, that's the expected behavior of the Git pre-commit hook due to the misspellings.
5. run git commit with the -n flag and push changes to the branch
   NOTE: This will bypass the Git pre-commit hook and initiate the Tests workflow, which should also fail as expected.
6. correct the misspellings in the test file
7. commit and push to the branch (without the -n flag)
   NOTE: At this point, the commit should go through and the Tests workflow should pass.

[zwhitfield3]

This PR is well structured with a clean implementation. The testing instructions were clear and easy to follow. This is fantastic work @erika-wallace! Can't wait to see this new CI check in action!