[MRG] Early classif streaming

[charavelg]

NonMyopicEarlyClassifier can now be used with yet incomplete series or streamed inputs
to retrieve optimal classification timing.

TODOs:

• check proba computation
• add tests for proba methods
• add streaming example

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.85%. Comparing base (70d3f68) to head (b61e3e2).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #668      +/-   ##
==========================================
+ Coverage   93.68%   93.85%   +0.16%     
==========================================
  Files          73       74       +1     
  Lines        6971     7081     +110     
==========================================
+ Hits         6531     6646     +115     
+ Misses        440      435       -5     

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