Add spell checker

[kaijli]

Adding spell checker as a github action to create tickets, modeled after link checker in schema repository

Options for action are:

1. https://github.com/marketplace/actions/spell-checker-action
2. https://github.com/marketplace/actions/spellchecker-cli + https://github.com/marketplace/actions/spellchecker-cli-summary
3. https://github.com/marketplace/actions/check-spelling
4. https://github.com/marketplace/actions/github-spellcheck

Listing for research purposes before implementation. Things to look for: custom dictionary, list of misspellings, use with ticket creation action for list of misspellings.

[ssarrafan]

Adding this issue for the next sprint to try to meet Jan deadline. If you prefer to have it in a later sprint let me know.

[ssarrafan]

@kaijli please add any updates to this issue. Moving to one more sprint.