Return NotImplemented for unsupported expr RHS

Change _expr_richcmp to return NotImplemented for unsupported right-hand operand types instead of raising TypeError, and remove the explicit numpy.ndarray special-case. This allows Python to fall back to reflected comparison methods when the other operand can handle the comparison.

Author: Zeroto521

src/pyscipopt/expr.pxi

@@ -60,10 +60,8 @@ if TYPE_CHECKING:
 
 
 def _expr_richcmp(self: Union[Expr, GenExpr], other, int op):
-    if isinstance(other, np.ndarray):
-        return NotImplemented
     if not isinstance(other, GENEXPR_OP_TYPES):
-        raise TypeError(f"Unsupported type {type(other)}")
+        return NotImplemented
 
     if op == Py_LE:
         if isinstance(other, NUMBER_TYPES):