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 5.00000% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.15%. Comparing base (868acb3) to head (300c54b).

Files with missing lines	Patch %	Lines
experiments/kripke/experiment.py	5.00%	19 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1368       +/-   ##
============================================
+ Coverage    50.07%   63.15%   +13.08%     
============================================
  Files           29       49       +20     
  Lines         2093     3930     +1837     
  Branches       341      344        +3     
============================================
+ Hits          1048     2482     +1434     
- Misses         972     1428      +456     
+ Partials        73       20       -53     

Files with missing lines	Coverage Δ
experiments/kripke/experiment.py	20.00% <5.00%> (-4.53%)	⬇️

... and 32 files with indirect coverage changes

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