feat: Add pre-commit support

[AleksaC]

This enables running vale with pre-commit.

[JacobCoffee]

As requested in discussion #556

[jdkato]

Thanks!

[Jarmos-san]

Thanks for the PR but it appears there's some issue with the .pre-commit-hooks.yaml file. I'm stumbling across this error message after running the pre-commit install --install-hooks command;

[INFO] Initialising environment for https://github.com/errata-ai/vale
An error has occurred: InvalidManifestError:
=====> ~/.cache/pre-commit/repokv40qx5e/.pre-commit-hooks.yaml is not a file.

Perhaps running the pre-commit validate-manifest command will suggest something about the file to be fixed?

[AleksaC]

Which revision of the repo are you using? I think it doesn't work on revisions that don't have the .pre-commit-hooks.yaml file. Currently the only one that would work is 16d3a7f. This works for me and should work in general:

repos:
  - repo: https://github.com/errata-ai/vale
    rev: 16d3a7f
    hooks:
      - id: vale

[Jarmos-san]

Got it, I was using the latest tagged version which obviously doesn't have the .pre-commit-hooks.yml file!.