Include package path as option

[miqdad-f]

Is your feature request related to a problem? Please describe.

In monorepo scenario, It would be great if there is package path option so the action will not run against the whole packages

Describe the solution you'd like

name: Package size report
        uses: pkg-size/action@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          path: path/to/package

Describe alternatives you've considered

Additional context