Persistent Kernel Cache

[csvance]

There are a few issues enabling this currently:

1. It turns on parallel compiliation but nvlink is not bundled with Reactant's CUDA jll
2. There appears to be invalidation issues where a cached kernel is re-used instead of invalidated on change. This leads to issues that appear like buffer aliasing. Need to investigate exactly what is going on here, less confident about the actual diagnosis

[csvance]

Working on upstreaming the bindings needed to actually get ReactantServer into a releasable state here: EnzymeAD/Reactant.jl#3277