create Spack package for Quokka

[BenWibking]

Describe the proposal
Create a Spack package for Quokka and create a PR to upstream it to the Spack repository.

This will enable users to install Quokka by doing, e.g.: spack install quokka and will automatically install all of the needed dependencies.

Describe alternatives you've considered
Require users to manually install dependencies and compile Quokka.

Additional context
For custom problems, users will still need to compile Quokka manually. However, it may still be useful in that scenario as a convenient, single-command-line way to automatically install of the dependencies needed by Quokka.

Spack documentation:
https://spack.readthedocs.io/en/latest/packaging_guide.html#writing-a-package-recipe