Add RollingTrend primitives and refactor some util methods

[ozzieD]

Resolves: #1806

also fix code coverage issues

[thehomebrewnerd]

Here are a couple small comments after a quick scan - need a little more time to digest what is happening in the new primitive.

[codecov]

Codecov Report

Merging #2170 (cccd725) into main (cd449e8) will increase coverage by 0.03%.
The diff coverage is 99.47%.

@@            Coverage Diff             @@
##             main    #2170      +/-   ##
==========================================
+ Coverage   99.26%   99.29%   +0.03%     
==========================================
  Files         143      145       +2     
  Lines       17506    17556      +50     
==========================================
+ Hits        17377    17432      +55     
+ Misses        129      124       -5     

Impacted Files	Coverage Δ
featuretools/primitives/utils.py	99.51% <ø> (-0.10%)	⬇️
...ools/tests/primitive_tests/test_primitive_utils.py	100.00% <ø> (ø)
featuretools/utils/time_utils.py	95.00% <94.59%> (-0.66%)	⬇️
featuretools/primitives/rolling_primitive_utils.py	100.00% <100.00%> (ø)
...ools/primitives/standard/aggregation_primitives.py	99.68% <100.00%> (+2.52%)	⬆️
...primitives/standard/rolling_transform_primitive.py	100.00% <100.00%> (ø)
...ls/tests/primitive_tests/test_rolling_primitive.py	100.00% <100.00%> (ø)
...ts/primitive_tests/test_rolling_primitive_utils.py	100.00% <100.00%> (ø)
featuretools/tests/utils_tests/test_time_utils.py	96.61% <100.00%> (+1.05%)	⬆️
featuretools/utils/api.py	100.00% <100.00%> (ø)
... and 1 more

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[tamargrey]

LGTM!

[sbadithe]

Woodwork tests should fix hopefully with #2182!