laghos changes

[rfhaque]

Description

This PR:

1. Adds a variant to set the problem order in experiment.py and application.py
2. Enables umpire in hypre and mfem
3. Enables GPU aware MPI in mfem
4. Enables compilation of caliper code blocks in the laghos code
5. Adds performance testing parameters for laghos for the different testing modes

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

• 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.
• If application.py upstreamed to Ramble is insufficient, add/modify repo/benchmark_name/application.py plus: create, self-assign, and link here a follow up issue with a link to the PR in the Ramble repo.
• Add/modify an experiments/benchmark_name/experiment.py to define an experiment

This PR depends on

• The laghos source PR shared device umpire pool CEED/Laghos#198 being merged
• Implementation of variable pool sizes in Laghos (Umpire device pool size, MFEM configuration log and FOM output to caliper CEED/Laghos#201)
• Resolution of runtime errors when running for different orders
• Change git url to the main repo in package.py

[pearce8]

@rfhaque Please:

• fix docs (they don't build)
• fix lint

[codecov-commenter]

Codecov Report

❌ Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.32%. Comparing base (a440f1a) to head (6da0597).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
lib/benchpark/variables.py	58.33%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1138      +/-   ##
===========================================
+ Coverage    63.25%   63.32%   +0.06%     
===========================================
  Files           45       45              
  Lines         3410     3419       +9     
  Branches       261      264       +3     
===========================================
+ Hits          2157     2165       +8     
- Misses        1244     1245       +1     
  Partials         9        9              

Files with missing lines	Coverage Δ
lib/benchpark/scaling.py	91.30% <100.00%> (+0.12%)	⬆️
lib/benchpark/variables.py	76.19% <58.33%> (-3.20%)	⬇️

... and 1 file with indirect coverage changes

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