Support installing compiler-tools with dependencies

[pbrisbin]

Since we moved to handling caching ourselves, and we store the cache at
the end of each step, installing compiler-tools separately from this
action would not include their build in said cache.

For example, if you intend to convert and upload coverage using hcp-lcov,
you can now do:

- id: stack
  uses: freckle/stack-action@v5
  with:
    compiler-tools: hpc-lcov
    stack-build-arguments: --coverage

- run: stack --no-terminal exec -- hpc-lcov --file "$HPC_ROOT"/combined/all/all.tix
  env:
    HPC_ROOT: ${{ steps.stack.outputs.local-hpc-root }}

- uses: codecov/codecov-action@v2
  with:
    files: ./lcov.info

Before, you would have to install the tool yourself, and use something
like stack-cache-action to have its build cached.