Changes for kripke and its dependencies

[rfhaque]

This PR:

• Adds throughput scaling parameters to the kripke experiment.py
• Updates kripke spack package to use the latest develop version of RAJA, Umpire, CHAI and camp.
• Adds the cxxstd variant to CHAI

Adding/modifying a benchmark (docs: Adding a Benchmark)

• Depends on Allocate and initialize memory on the GPU Kripke#76
• If package.py upstreamed to Spack is insufficient, add/modify repo/benchmark_name/package.py plus: create, self-assign, and link here a follow up issue with a link to the PR in the Spack repo.
• Add/modify an experiments/benchmark_name/experiment.py to define an experiment

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.26%. Comparing base (665645b) to head (64206e8).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1368      +/-   ##
===========================================
+ Coverage    62.71%   64.26%   +1.54%     
===========================================
  Files           49       49              
  Lines         3811     3811              
  Branches       338      338              
===========================================
+ Hits          2390     2449      +59     
+ Misses        1402     1343      -59     
  Partials        19       19              

Files with missing lines	Coverage Δ
experiments/kripke/experiment.py	24.52% <ø> (ø)

... and 2 files with indirect coverage changes

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