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Actually on the mypy cache, we can skip mtime checks, which makes a named cache possible... :thread:

`main` after touching a single file and checking it:
```LOG:  Build finished in 3.553 seconds with 236 modules, and 0 errors```
with my changes:
```LOG:  Build finished in 0.497 seconds with 236 modules, and 0 errors```


<@U06A03HV1> mypy _appears_ to be atomic in writing of the cache files.
So `cache_dir = f".cache/mypy_cache/{hash(build_root.path)}"` is basically all we need :open_mouth:

Obviously we should make sure we aren't making bad assumptions but :tada:

Now I'm even more motivated to remove pylint from my repo

(meanwhile! 90% chance of an append-only cache bug over in <https://pantsbuild.slack.com/archives/C046T6T9U/p1658412143380059> … they’re scary, but i think that we probably understand this usecase well enough to use them by default)

I'll get a PR next time I'm working on stuff

<https://github.com/pantsbuild/pants/pull/16276>