Add adiak import/export support

[daboehme]

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[codecov-io]

Codecov Report

Merging #188 into master will decrease coverage by 0.02%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
- Coverage   76.05%   76.03%   -0.03%     
==========================================
  Files         123      123              
  Lines        8128     8129       +1     
==========================================
- Hits         6182     6181       -1     
- Misses       1946     1948       +2

Impacted Files	Coverage Δ
src/reader/CaliperMetadataDB.cpp	88.8% <50%> (-0.69%)	⬇️

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