Add rule to check for irregular spaces

[sblaisot]

This PR adds a rule to check if state contains irregular spaces as discussed under #74.
Irregular spaces are usually unneeded and unwanted.

List taken from similar ESLint rule.

[roaldnefs]

Thanks @sblaisot for the PR!

Maybe the non-braking space isn't the only irregular whitespace we want to look for. Would it be possible to update this rule with other characters and rename it to NonIrregularWhitespaceRule? Besides possible parsing errors the irregular whitespace also make code harder to debug in a similar nature to mixed tabs and spaces.

We might take the no-irregular-whitespace from ESLint: https://eslint.org/docs/rules/no-irregular-whitespace as an example.

[sblaisot]

ok, I updated to detect all Irregular Spaces

[roaldnefs]

Thanks @sblaisot for updating the rule! I'm going the merge the pull request but might update it to include https://docs.saltstack.com/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html#yaml-supports-only-plain-ascii before the next release.