Implement switches for configuring coefficient names

[redeboer]

Implement a switch in the HelicityAmplitudeBuilder with which you can render coefficient names LS-combinations and/or helicities, or even nothing. Currently, coefficient names are differentiated by decay chain (i.e. resonance names) and:

• LS-combination in case of formalism="canonical-helicity"
• final state helicities in case of formalism="helicity"

See Helicity versus canonical and #42. In ComPWA/compwa.github.io#111 (and an ongoing analysis), though, it is necessary to run generate the amplitude model with canonical helicity, but with helicity coefficient names in order to reproduce the coefficients from Table 1.

See also #254