Add support for oversampling in time series classification problems

[christopherbunn]

Resolves #3151

[codecov]

Codecov Report

Merging #3387 (57da94a) into main (1b8b6bf) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #3387     +/-   ##
=======================================
+ Coverage   99.6%   99.6%   +0.1%     
=======================================
  Files        329     329             
  Lines      32227   32231      +4     
=======================================
+ Hits       32098   32102      +4     
  Misses       129     129             

Impacted Files	Coverage Δ
evalml/pipelines/utils.py	99.5% <100.0%> (ø)
.../integration_tests/test_time_series_integration.py	100.0% <100.0%> (ø)
evalml/tests/pipeline_tests/test_pipeline_utils.py	99.7% <100.0%> (+0.1%)	⬆️

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[freddyaboulton]

Thank you @christopherbunn !