Feature iid issue #15

[TobiasRasbold]

Hi @mansenfranzen
Issue #15 should be done with this PR.

• IntervalIdentifier is able to use only 'marker_start' for creating intervals
• 'transform'- functions in VectorizedCumSum is enhanced for pyspark and pandas
• adding tests 'test_identical_start_end_marker' for pyspark and pandas

[codecov[bot]]

Codecov Report

Merging #17 into master will increase coverage by 0.07%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage    96.8%   96.87%   +0.07%     
==========================================
  Files          22       22              
  Lines         844      864      +20     
  Branches       98      103       +5     
==========================================
+ Hits          817      837      +20     
  Misses         19       19              
  Partials        8        8

Impacted Files	Coverage Δ
src/pywrangler/wranglers.py	100% <100%> (ø)	:arrow_up:
...pywrangler/pandas/wranglers/interval_identifier.py	100% <100%> (ø)	:arrow_up:
...ywrangler/pyspark/wranglers/interval_identifier.py	100% <100%> (ø)	:arrow_up:

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