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effective spin distributions

Add distributions over effective spins (at least chi_eff). Support two types of distributions

  • p(chi_eff|q)
  • p(chi_eff|mass1_source, mass2_source)

Specifically, support

  • IsotropicPowerLawMagnitudeChiEff (see LIGO-P2100112)
  • BetaChiEff
  • TruncatedGaussianChiEff

Additionally add support to automatically compute "draw probability" needed to importance sample over chi_eff from distributions over the component spins (see LIGO-T2200294). Do this by using the draw probability over component spins, IsotropicPowerLawSpin1Spin2 (with appropriate parameters), and IsotropicPowerLawMagnitudeChiEff in the appropriate combination.