Adds support for temporal covariate ref

[gowthamrao]

#13

[codecov]

Codecov Report

Merging #14 (1ae1f74) into main (da3f3d3) will decrease coverage by 0.50%.
The diff coverage is 14.28%.

❗ Current head 1ae1f74 differs from pull request most recent head a0ee1a8. Consider uploading reports for the commit a0ee1a8 to get more accurate results

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   89.99%   89.49%   -0.50%     
==========================================
  Files           7        7              
  Lines        1069     1076       +7     
==========================================
+ Hits          962      963       +1     
- Misses        107      113       +6     

Impacted Files	Coverage Δ
R/RunCharacterization.R	92.12% <14.28%> (-2.61%)	⬇️

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[alondhe]

Hello @gowthamrao and @jreps! Is this PR no longer in scope for Characterization, or is it still in consideration?