Create framework deployment mechanism

[knoepfel]

DUNE US S&C R&D item 067

The framework code needs a deployment mechanism that includes code distribution and relocatable binary installation. The code distribution will be through one or more GitHub repositories, and binary installation will probably be achieved using Spack.

[knoepfel]

A Spack recipe exists for the phlex repository at https://github.com/Framework-R-D/phlex-spack-recipes/blob/main/spack_repo/phlex/packages/phlex/package.py.