fix: improve profiling code logic

[fabclmnt]

• Remove unused methods
• Improve logic to ease code maintenance
• Improve code performance (optimized with threads)
• Fix Spark code to harness its native distributed capabilities

[codecov]

Codecov Report

Attention: Patch coverage is 82.14286% with 35 lines in your changes missing coverage. Please review.

Project coverage is 90.03%. Comparing base (9195531) to head (5d5ae1b).
Report is 46 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/ydata_profiling/model/summary.py	57.14%	9 Missing ⚠️
src/ydata_profiling/model/missing.py	77.77%	8 Missing ⚠️
src/ydata_profiling/model/dataframe.py	66.66%	5 Missing ⚠️
src/ydata_profiling/model/correlations.py	84.61%	4 Missing ⚠️
src/ydata_profiling/model/summarizer.py	80.00%	4 Missing ⚠️
src/ydata_profiling/model/describe.py	72.72%	3 Missing ⚠️
src/ydata_profiling/profile_report.py	80.00%	1 Missing ⚠️
tests/issues/test_issue537.py	93.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1728      +/-   ##
===========================================
- Coverage    90.25%   90.03%   -0.23%     
===========================================
  Files          198      201       +3     
  Lines         6477     6621     +144     
===========================================
+ Hits          5846     5961     +115     
- Misses         631      660      +29     

Flag	Coverage Δ
py3.12-ubuntu-22.04-pandas	90.03% <82.14%> (?)
py3.8-ubuntu-22.04-pandas	?

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