feat: match ignores against directly invoked paths

[seren5240]

for https://github.com/getgrit/rewriter/issues/9042

Unfortunately, there isn't a way to do this out of the box with ignore's interface. There was a crate exposing closer functionality but it's been archived.

[morgante]

Thanks for adding the memo-ization, and sorry for the false start, but I'm still a bit hesitant about the additional complexity in this PR. We are re-implementing key parts of ignore (directory traversal upwards / searching for gitignore files) to work around what feels like a bug in ignore.

Doing a bit more research:

• Passing a path argument doesn't respect .gitignore BurntSushi/ripgrep#829 looks related / symptomatic of the problem
• https://github.com/JohnnyMorganz/StyLua/pull/765/files as well

Overall I think we are best taking some other approaches:

1. Simply ignore this issue. The original bug I reported (https://github.com/getgrit/rewriter/issues/9042) was not this, and it doesn't seem unreasonable to always analyze directly invoked paths.
2. Try fixing the problem upstream, it looks like there might be some fruitful code on the branch of the linked issue. Looks like the problems might be around https://github.com/BurntSushi/ripgrep/blob/master/crates/ignore/src/walk.rs#L1027-L1031 and the short-circuiting for depth 0.
3. Reuse the Walker's gitignore that it built up instead of making a parallel implementation. https://github.com/JohnnyMorganz/StyLua/pull/765/files looks closer to this.