Add non-tensor shared

[jeremylt]

This is a prereq for the long awaited */gen non-tensor support.

[jeremylt]

Edit: This is solved, it was a bad grid size for the weights kernel

Investigating error on PETSc BP3:

Test: petsc-bps BP3, tet elements
  $ build/petsc-bps -ceed /gpu/cuda/shared -test -problem bp3 -degree 3 -ksp_max_it_clip 50,50 -simplex
ERROR: returncode = 15
Output: 
NO MESSAGE
FAIL: stderr
Output: 
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: Caught signal number 8 FPE: Floating Point Exception,probably divide by zero
[0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
[0]PETSC ERROR: or see https://petsc.org/release/faq/#valgrind and https://petsc.org/release/faq/
[0]PETSC ERROR: or try https://docs.nvidia.com/cuda/cuda-memcheck/index.html on NVIDIA CUDA systems to find memory corruption errors
[0]PETSC ERROR: configure using --with-debugging=yes, recompile, link, and run 
[0]PETSC ERROR: to get more information on the crash.
Abort(59) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0

[jeremylt]

Edit: This happens on my machine on main too, so its not related to this MR.

Also - t354 is failing on my machine but not in CI, so that's odd. I thought it was my CUDA update causing troubles but it persists after restarting.

[jeremylt]

Ok, I need to actually test the HIP code, but we've got everything working on the CUDA side of the house.

Edit: Confirmed the new code compiles on Noether, but still bringing my local dev machine back up to date to test

$ make prove -j CEED_BACKENDS=/gpu/cuda/shared passes locally for Ratel with this branch.