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

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 (Adding input option for umpire device pool size tomstitt/Laghos#1)
• Resolution of runtime errors when running for different orders
• Change git url to the main repo in package.py

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.14%. Comparing base (aa293c0) to head (7648ef0).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1138      +/-   ##
===========================================
+ Coverage    65.02%   65.14%   +0.12%     
===========================================
  Files           44       44              
  Lines         3274     3274              
  Branches       261      261              
===========================================
+ Hits          2129     2133       +4     
+ Misses        1135     1131       -4     
  Partials        10       10              

see 1 file with indirect coverage changes

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