Specify flooring function in each method

[tky823]

Summary

This PR allows us to customize a flooring function per method, improving mathematical operations' numerical stability.

[codecov-commenter]

Codecov Report

Base: 94.35% // Head: 94.39% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (2677b1f) compared to base (32f5bcb).
Patch coverage: 96.58% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #228      +/-   ##
==========================================
+ Coverage   94.35%   94.39%   +0.03%     
==========================================
  Files          39       41       +2     
  Lines        4981     5122     +141     
==========================================
+ Hits         4700     4835     +135     
- Misses        281      287       +6     

Impacted Files	Coverage Δ
ssspy/bss/_flooring.py	0.00% <0.00%> (ø)
ssspy/bss/_update_spatial_model.py	99.00% <ø> (ø)
ssspy/utils/flooring.py	76.92% <76.92%> (ø)
ssspy/bss/ipsdta.py	90.04% <94.11%> (+0.32%)	⬆️
ssspy/bss/fdica.py	92.42% <94.44%> (+0.11%)	⬆️
ssspy/bss/iva.py	96.23% <97.22%> (+0.04%)	⬆️
ssspy/bss/ilrma.py	97.01% <98.75%> (+0.10%)	⬆️
ssspy/bss/_psd.py	100.00% <100.00%> (ø)
ssspy/bss/cacgmm.py	90.73% <100.00%> (+0.25%)	⬆️
ssspy/bss/mnmf.py	94.47% <100.00%> (+0.17%)	⬆️
... and 2 more

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