Merge pull request #225 from jorenham/optimize.linear_sum_assignment

`optimize`: complete `linear_sum_assignment`

Author: jorenham

scipy-stubs/optimize/_lsap.pyi

@@ -1,3 +1,7 @@
-from scipy._typing import Untyped
+import numpy as np
+import optype.numpy as onp
 
-def linear_sum_assignment(*args: Untyped, **kwargs: Untyped) -> Untyped: ...
+def linear_sum_assignment(
+    cost_matrix: onp.ToFloat2D,
+    maximize: onp.ToBool = False,
+) -> tuple[onp.Array1D[np.intp], onp.Array1D[np.intp]]: ...