Short expansion of conditional mutual information

[kahaaga]

No need for review here yet. I still have some polishing to do.

Implements #309

What is in this PR?

• New conditional association measure ShortExpansionConditionalMutualInformation (SECMI for short).
• New independence test SECMITest based on this measure.
• Examples.
• Tests.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.85507% with 7 lines in your changes missing coverage. Please review.

Project coverage is 94.54%. Comparing base (1054b8f) to head (c626479). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../short_expansion_conditional_mutual_information.jl	84.61%	4 Missing :warning:
src/independence_tests/secmi/secmi_test.jl	91.66%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #387      +/-   ##
==========================================
- Coverage   94.65%   94.54%   -0.11%     
==========================================
  Files         111      113       +2     
  Lines        3198     3263      +65     
==========================================
+ Hits         3027     3085      +58     
- Misses        171      178       +7     

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