Convert all existing rules to use a walk function instead of extending AbstractRule

[JoshuaKGoldberg]

Partner to #586: following palantir/tslint#2522, we should be recommending a ts.forEachChild strategy.

Accepting any PRs that take an existing rule and convert it to walk! ✨

[JoshuaKGoldberg]

The change in #682 to no-for-in is a good example of how to approach this 😊

Edit: whoops, allowed the PR to close the issue. Any other rules yet to be converted are still fair game!

[IllusionMH]

Reopening this issue because it tracks migration of all rules and was closed automatically with fixes #NNN text in PR text.

Note to reviewers: check if PR text strictly follows template and will close this one again.

[JoshuaKGoldberg]

Looks like this was accomplished. Thanks so much folks! 💖