Add generalized-Laguerre sequence interlacing

[PerAlexandersson]

Closes #365

Summary:

• extend the bilinear derivative-recurrence backend with nonnegative-coefficient and adjacent Prec results
• package the generalized-Laguerre reduction as degree, Prec, Interlaces, and rowwise real-rootedness theorems
• add rr_generalized_laguerre_second_derivative_sequence with numeral normalization
• add smoke tests for (m,c) = (1,2), (2,2), and (4,6)

Verification:

• lake-workspace build RealRooted.DerivativeRecurrence.GeneralizedLaguerreInterlacing RealRooted.Tactic.Examples.GeneralizedLaguerre
• lake-workspace build RealRooted.Tactic.Examples.OEISTestbed
• lake-workspace build RealRooted.Tactic RealRooted.Tactic.Examples RealRooted
• axiom audit: only propext, Classical.choice, and Quot.sound