feat: let/lets <pronoun> to do→let/lets <pronoun> do

[hippietrail]

Issues

Fixes #425

Description

This doesn't attempt to fix all errors with "let" and "lets", just the ones using a pronoun and an ungrammatical "to" before the verb such as "Let me to do it" and "This lets anybody to do it".

It even works with common errors such as "let's" in place of "lets", "noone" in place of "no one", "some body" in place of "somebody", etc.

It does not lint nouns or noun phrases, only pronouns:

• 🚫 "Let the user to do it".
• 🚫 "This lets non-native speakers to avoid mistakes".

Those are probably more complex and should probably be done as a separate linter, at which point both linters should probably be put into a LintGroup so that one named option enables/disables both.

How Has This Been Tested?

I've added unit tests for many combinations, preferably from sentences found on GitHub, but using a few other sites too.

Checklist

• I have performed a self-review of my own code
• I have added tests to cover my changes