EffectEstimate dataclass

[jmafoster1]

Closes #340.

• Renamed TestValue class to EffectEstimate and moved it into estimation
• Changed to having estimators return an EffectEstimate instance rather than a tuple

This is much cleaner than the old solution as estimation methods now return one tidy object that's always of the same type.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	33		0	0.93s
✅ PYTHON	pylint	33		0	5.49s

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[codecov]

Codecov Report

❌ Patch coverage is 96.51163% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.28%. Comparing base (9816b98) to head (6346755).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
causal_testing/testing/causal_test_result.py	77.77%	2 Missing ⚠️
causal_testing/main.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #353      +/-   ##
==========================================
+ Coverage   95.67%   96.28%   +0.61%     
==========================================
  Files          27       28       +1     
  Lines        1618     1590      -28     
==========================================
- Hits         1548     1531      -17     
+ Misses         70       59      -11     

Files with missing lines	Coverage Δ
...ausal_testing/estimation/cubic_spline_estimator.py	96.66% <100.00%> (+0.11%)	⬆️
causal_testing/estimation/effect_estimate.py	100.00% <100.00%> (ø)
...ausal_testing/estimation/experimental_estimator.py	100.00% <100.00%> (ø)
...ting/estimation/instrumental_variable_estimator.py	100.00% <100.00%> (ø)
causal_testing/estimation/ipcw_estimator.py	99.25% <100.00%> (+<0.01%)	⬆️
..._testing/estimation/linear_regression_estimator.py	100.00% <100.00%> (ø)
...esting/estimation/logistic_regression_estimator.py	100.00% <100.00%> (ø)
...l_testing/surrogate/surrogate_search_algorithms.py	98.48% <100.00%> (ø)
causal_testing/testing/causal_effect.py	98.59% <100.00%> (+0.04%)	⬆️
causal_testing/testing/causal_test_adequacy.py	86.76% <100.00%> (-0.25%)	⬇️
... and 3 more

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[f-allian]

@jmafoster1 Good idea moving this all into a data class. Looks good to me 👍🏼