Fixes to the CD Pipeline

[f-allian]

Previously the CD pipeline was incorrectly configured with the following steps:

• Install from source -> build the distribution -> then upload to PyPI
• This resulted in missing dependencies, likely causing the issue from Pip-installed version not including causal_testing.testing.causal_effect #333

Solution:

• Removed installation from source. The pipeline now just builds and uploads the distributions directly (see image below that causal_testing.testing.causal_effect.py is now correctly included in the build process.)
• This simplifies the setup process and ensures all tools are up-to-date.
• Minor: also made /estimation directory a module as this was assumed due to the implicit namespace conventions in Python 3+.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	32		0	1.0s
✅ PYTHON	pylint	32		0	6.62s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.75%. Comparing base (a7fc0af) to head (febf7e7).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #334   +/-   ##
=======================================
  Coverage   95.75%   95.75%           
=======================================
  Files          27       27           
  Lines        1624     1624           
=======================================
  Hits         1555     1555           
  Misses         69       69           

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