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I want to slowly bring pants into a monorepo. Is it possible to tell pants to ignore every directory, but an explicit whitelist?

I was using [tailor].ignore_paths -- but that only gets me so far and is pretty high cost to continually add ignore paths.

Ideally I'd love this

```[tailor]
ignore_paths = [
  "**/*",
  "!path/i/want",
  "!path/i/also/want",
]```

<https://www.pantsbuild.org/2.20/reference/global-options#pants_ignore|https://www.pantsbuild.org/2.20/reference/global-options#pants_ignore> sounds like it might be what you want

Although that potentially has the same inverted logic issue

"ignore" could mean a few different things, but marker files <https://www.pantsbuild.org/2.18/docs/using-pants/key-concepts/source-roots#configuring-source-roots-using-marker-files>
could work somewhat like an allow-list

Basically I want to run pants tailor check in CI, but I don't want to warn on all of the things not added.