Add InterruptedTimeSeries class

[drbenvincent]

• Adds InterruptedTimeSeries class, both PyMC and Scikit-learn versions.
• Updates the Covid-19 example notebook to use the new InterruptedTimeSeries class. This notebook will be moved into a new ITS section of the docs by Improve layout of the docs #181
• Also adds a kwarg to the plot method to address Timeseries experiment class reporting synthetic control label? #160
• Updated the pymc integration tests
• Closes Add InterruptedTimeSeries class #191, Timeseries experiment class reporting synthetic control label? #160

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Codecov Report

Merging #200 (b7f023a) into main (b61295e) will increase coverage by 0.11%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
+ Coverage   70.22%   70.34%   +0.11%     
==========================================
  Files          19       19              
  Lines        1001     1005       +4     
==========================================
+ Hits          703      707       +4     
  Misses        298      298              

Impacted Files	Coverage Δ
causalpy/pymc_experiments.py	59.03% <66.66%> (+0.26%)	⬆️
causalpy/skl_experiments.py	64.77% <80.00%> (+0.44%)	⬆️
causalpy/tests/test_integration_pymc_examples.py	100.00% <100.00%> (ø)