elapsed time tracking

[elbeejay]

Prototyping the addition of a metadata field that tracks the elapsed time between when a model is initialized and when it is finalized. Could be useful when designing and running a test case that is then intended to be repeated a bunch of times with similar parameters. Relates to #225

Still need to write tests for this and make sure it works as expected...

[codecov]

Codecov Report

Merging #226 (f86844e) into develop (890f242) will decrease coverage by 0.06%.
The diff coverage is 63.63%.

@@             Coverage Diff             @@
##           develop     #226      +/-   ##
===========================================
- Coverage    78.59%   78.52%   -0.07%     
===========================================
  Files           12       12              
  Lines         2560     2571      +11     
===========================================
+ Hits          2012     2019       +7     
- Misses         548      552       +4     

Impacted Files	Coverage Δ
pyDeltaRCM/iteration_tools.py	92.94% <42.85%> (-2.36%)	⬇️
pyDeltaRCM/init_tools.py	97.03% <100.00%> (+<0.01%)	⬆️
pyDeltaRCM/model.py	89.51% <100.00%> (+0.04%)	⬆️

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