PiPi S wave

[jiangyi15]

pipi Swave and relative models from AmpGen.

pipi:
     J: 0
     P: 1
     model: pipi_Swave
     all_tokens:   # list of independent parts
         - pole.0
         - pole.1
         - prod.0

Also support KK S wave which use tokens poleKK.0

[codecov]

Codecov Report

Attention: Patch coverage is 92.75362% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 78.28%. Comparing base (81d5ac3) to head (a224d62).

Files	Patch %	Lines
tf_pwa/amp/ampgen_pipi_swave.py	92.66%	8 Missing and 3 partials ⚠️
tf_pwa/amp/ampgen_FOCUS.py	94.54%	2 Missing and 1 partial ⚠️
tf_pwa/amp/core.py	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #142      +/-   ##
==========================================
+ Coverage   78.09%   78.28%   +0.18%     
==========================================
  Files         119      121       +2     
  Lines       17975    18178     +203     
  Branches     3383     3407      +24     
==========================================
+ Hits        14037    14230     +193     
- Misses       3192     3198       +6     
- Partials      746      750       +4     

Flag	Coverage Δ
unittests	78.28% <92.75%> (+0.18%)	⬆️

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