spell-var-name: human readable variable names

[cidrblock]

Starting to pull in possible rule ideas from the community of practice: redhat-cop/automation-good-practices#64

Ensure variable names are human-readable.

I'm not sure how exactly to do this one without maintaining a dictionary or pulling in a 3rd party dictionary and running a spell check on fact and variable names.

The spell check could also be done on task names as well.

Short of adding anything to ansible-lint, we could also suggest and document the use of cspell in a recommit hook or github action.

Thoughts?

[cidrblock]

incl compound words: ansible/ansible-navigator#1221