gh-37209: Added rational Tamari lattices
Added the possibility to provide a rational slope parameter m in the
GeneralizedTamariLattice method.
The lattice property is no longer conjectural so the check parameter is
not necessary anymore.
Also updated the references.
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URL: https://github.com/sagemath/sage/pull/37209
Reported by: Cchenevi
Reviewer(s): Frédéric Chapoton
