Make weights parameter private

[Ddelval]

Choosing the weights for the numerical quadrature used during the calculation of FPCA does not seem like a parameter that the end user should need to tweak. Therefore, it has been removed from the documentation, and its name in the constructor has been prepended with an underscore to indicate that it is a private parameter now

[codecov]

Codecov Report

Base: 85.28% // Head: 85.28% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (6215705) compared to base (099560f).
Patch coverage: 75.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #483      +/-   ##
===========================================
- Coverage    85.28%   85.28%   -0.01%     
===========================================
  Files          137      137              
  Lines        11043    11040       -3     
===========================================
- Hits          9418     9415       -3     
  Misses        1625     1625              

Impacted Files	Coverage Δ
skfda/preprocessing/dim_reduction/_fpca.py	90.98% <66.66%> (-0.22%)	⬇️
skfda/tests/test_fpca.py	99.30% <100.00%> (ø)

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