Allow changed files as input

[pecigonzalo]

We have a use-case in which we want to enrich the changed files/paths with some script and then run it through the filter. Since this action already does 90% of the job, I think it would be a great addition to support an additional optional input here that passes the list, instead of creating a new action.

Let me know what you think, and what would be required in order to merge this.

Thanks!

Example use-case:

      - uses: dorny/paths-filter@v3
        id: filter
        with:
          list-files: shell
          filters: |
            go:
              - go.mod
              - go.sum
              - "**.go"

      - id: go-find-cmd
        if: steps.filter.outputs.go == 'true'
        run: |
          echo "cmds<<EOF" >> "$GITHUB_OUTPUT"
          echo "$(./hack/go-find-cmd ${{ steps.filter.outputs.go_files }})" >> "$GITHUB_OUTPUT"
          echo "EOF" >> "$GITHUB_OUTPUT"

      - uses: pecigonzalo/paths-filter@feature/input-files
        if: steps.filter.outputs.go == 'true'
        id: go-filter
        with:
          files: ${{ steps.go-find-cmd.outputs.cmds }}
          filters: |
            foo:
              - cmd/foo/**
            bar:
              - cmd/bar/**

./hack/go-find-cmd provides yaml output like:

- foo
- bar