Move default pair_selector

[tky823]

Summary

Move ssspy._bss._select_pair to ssspy.utils.pair_selector.
In addition, sequential_pair_selector is used in IP2 and ISS2.

close #148

[codecov-commenter]

Codecov Report

Base: 94.66% // Head: 94.66% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (ba61546) compared to base (46061fb).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #225   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files          38       39    +1     
  Lines        4573     4575    +2     
=======================================
+ Hits         4329     4331    +2     
  Misses        244      244           

Impacted Files	Coverage Δ
ssspy/bss/_select_pair.py	100.00% <100.00%> (ø)
ssspy/bss/_update_spatial_model.py	99.00% <100.00%> (ø)
ssspy/bss/fdica.py	92.50% <100.00%> (ø)
ssspy/bss/ilrma.py	96.90% <100.00%> (-0.02%)	⬇️
ssspy/bss/iva.py	96.19% <100.00%> (-0.02%)	⬇️
ssspy/utils/select_pair.py	100.00% <100.00%> (ø)

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