Function py_kopf_kmatrix_f0 

pub fn py_kopf_kmatrix_f0(
    tags: &Bound<'_, PyTuple>,
    couplings: [[PyParameter; 2]; 5],
    channel: PyKopfKMatrixF0Channel,
    mass: PyMass,
    seed: Option<usize>,
) -> PyResult<PyExpression>

Construct the fixed Kopf f0 K-matrix amplitude.