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

❌ Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.03%. Comparing base (3c75d75) to head (cc46409).

Files with missing lines	Patch %	Lines
experiments/kripke/experiment.py	8.33%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1368      +/-   ##
===========================================
+ Coverage    62.70%   64.03%   +1.33%     
===========================================
  Files           51       51              
  Lines         4073     4082       +9     
  Branches       356      357       +1     
===========================================
+ Hits          2554     2614      +60     
+ Misses        1489     1438      -51     
  Partials        30       30              

Files with missing lines	Coverage Δ
experiments/kripke/experiment.py	22.58% <8.33%> (-1.95%)	⬇️

... and 2 files with indirect coverage changes

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