Make dynamics builder more configurable

[shenvitor]

We want to add the options to switch off Form Factor(s) of production and/or decay

ampform-dpd/src/ampform_dpd/dynamics/builder.py

Lines 24 to 39 in 92359b7

	def formulate_breit_wigner_with_form_factor(
	decay: ThreeBodyDecayChain,
	) -> tuple[sp.Expr, dict[sp.Symbol, complex | float]]:
	decay_node = decay.decay_node
	s = get_mandelstam_s(decay_node)
	parameter_defaults = {}
	production_ff, new_pars = _create_form_factor(s, decay.production_node)
	parameter_defaults.update(new_pars)
	decay_ff, new_pars = _create_form_factor(s, decay_node)
	parameter_defaults.update(new_pars)
	breit_wigner, new_pars = _create_breit_wigner(s, decay_node)
	parameter_defaults.update(new_pars)
	return (
	production_ff * decay_ff * breit_wigner,
	parameter_defaults,
	)

[redeboer]

This requires a builder pattern that produces callables. There's something like this in AmpForm, see here.