feat: add support for OrderedRing.natCast_nonneg in grind
#11664
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This PR adds support for `Nat.cast` in `grind linarith`. It now uses `Grind.OrderedRing.natCast_nonneg`. Example: ```lean open Lean Grind Std attribute [instance] Semiring.natCast variable [Lean.Grind.CommRing R] [LE R] [LT R] [LawfulOrderLT R] [IsLinearOrder R] [OrderedRing R] example (a : Nat) : 0 ≤ (a : R) := by grind example (a b : Nat) : 0 ≤ (a : R) + (b : R) := by grind example (a : Nat) : 0 ≤ 2 * (a : R) := by grind example (a : Nat) : 0 ≥ -3 * (a : R) := by grind ```
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This PR adds support for
Nat.castingrind linarith. It now usesGrind.OrderedRing.natCast_nonneg. Example: