Add a hook option for passing *all* repo files as args to it

[Jackenmen]

This is inspired by my want to type-check my entire repository with ty whenever prek runs (regardless of what files are actually changed) but not wanting it to include any untracked files I have. This is something that's hard to do with just a hook configuration, as you can see in the 4 comments starting from: astral-sh/ty#269 (comment)

The best I can do is either:

repos:
  - repo: local
    hooks:
      - id: ty-check
        name: ty-check
        language: system
        entry: ty check .
        pass_filenames: false

or the python language variant:

repos:
  - repo: local
    hooks:
      - id: ty-check
        name: ty-check
        language: python
        entry: ty check .
        pass_filenames: false
        args: [--python=.venv/]
        additional_dependencies: [ty]

which will both run ty check on all files, including untracked.

It would be better if I could specify some option, maybe all_files: true, to have that hook always run as if it were run as part of prek run --all-files. While I could have a hook with a custom Python script that calls git ls-files, it's certainly more involved than being able to just define this through metadata (and slower due to e.g. Python startup times; also, prek can reuse the generated list for multiple hooks needing this or perhaps even for its own use).
I should note that this would be, to my knowledge, the first new feature for the hook configuration format (.pre-commit-hooks.yaml); from what I understand, so far only the project configuration (prek.toml / .pre-commit-config.yaml) may have extra features in it.

A similar feature was suggested in the pre-commit repo a couple of times in the past, but these suggestions were rejected:
pre-commit/pre-commit#2194
pre-commit/pre-commit#2405
pre-commit/pre-commit#2818
A similar sentiment of not wanting untracked files to affect what the hook does can be seen in other issues:
pre-commit/pre-commit#708
pre-commit/pre-commit#1212
pre-commit/pre-commit#1981
pre-commit/pre-commit#2660 (maybe, the description does not make it clear)

[j178]

Let's continue in #2730

[Jackenmen]

The linked issue has been fixed but I don't think prek allows to pass all filenames to a hook now?