Added RAJA/CUDA/MPI example

[metere1llnl]

I added an example, adapted from the BLT smoke test, using RAJA/CUDA, CUDA and MPI.

[codecov]

Codecov Report

Merging #624 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #624   +/-   ##
========================================
  Coverage    98.66%   98.66%           
========================================
  Files           65       65           
  Lines         1269     1269           
========================================
  Hits          1252     1252           
  Misses          17       17

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@438657b). Click here to learn what that means.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             develop      #624   +/-   ##
===========================================
  Coverage           ?   98.660%           
===========================================
  Files              ?        65           
  Lines              ?      1269           
  Branches           ?         0           
===========================================
  Hits               ?      1252           
  Misses             ?        17           
  Partials           ?         0           

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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