integration with new basic TimeFrame sampling built-ins in mmif-python

[keighrim]

fixes#277

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.52%. Comparing base (ac6c188) to head (7c172df).
⚠️ Report is 8 commits behind head on develop.

Additional details and impacted files

@@ Coverage Diff @@## develop #278 +/- ##
===========================================
+ Coverage 61.24% 61.52% +0.28% 
===========================================
Files 6 6 Lines 805 811 +6 ===========================================
+ Hits 493 499 +6 
Misses 312 312 

Flag	Coverage Δ
unittests	61.52% <100.00%> (+0.28%)	⬆️

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