feat: adding slim action

[sorenmat]

Fixes #

Proposed Changes

1. Adding an sub action that can run using the slim image

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[admiralAwkbar]

@sorenmat

Great addition. I wanted to add a readme.md to slim/README.md to help users understand but looks like you don't have the permissions open enough for me to add it in...

If you want to finish up on this PR can you add the file?

# GitHub Super-Linter Slim Image Action

The **GitHub Super-Linter** maintains `two` major images:

- `github/super-linter:v4`
- `github/super-linter:slim-v4`

In order to help users pull this image more naturally, the `action.yml` in this directory can help users pull the `slim image`.

#### Slim Image

The slim `github/super-linter:slim-v4` comes with all supported linters but removes the following:

- `rust` linters
- `dotenv` linters
- `armttk` linters
- `pwsh` linters
- `c#` linters

By removing these linters, we were able to bring the image size down by `2gb` and drastically speed up the build and download time.
The behavior will be the same for non-supported languages, and will skip languages at run time.
Example usage:

```yml
################################
# Run Linter against code base #
################################
- name: Lint Code Base
  uses: github/super-linter/slim@v4
  env:
    VALIDATE_ALL_CODEBASE: false
    DEFAULT_BRANCH: master
    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}