Typo suggestions in more places in stack

See https://github.com/commercialhaskell/stack/issues/158 , where it will suggest near matches of the user's input. This only works for things like `stack build pkg-0.0...`. It'd be great to have fuzzy suggestions for all of the following:
- [ ] Targets. Ideally this would handle fuzzy suggestions of package names and component names. Bonus would also be supporting fuzzy suggestions of dirs, but that's not a big deal.
- [ ] extra-deps. See also https://github.com/commercialhaskell/stack/issues/1521
- [ ] filepaths? For example `--stack-yaml`
- [ ] more?

Ideally, these suggestions would share the same system as shell completion (see https://github.com/commercialhaskell/stack/issues/1343 and https://github.com/commercialhaskell/stack/issues/832 . This way we can get checking and suggestions from the same mechanism!

(but of course, PRs adding any of these will be accepted, no need to do it all)