✨: add HasArrayILShift protocol to support in-place left shift operator for array classes

Author: nstarman

src/array_api_typing/_array.py

@@ -446,6 +446,22 @@ def __lshift__(self, other: Self | int, /) -> Self:
         ...
 
 
+class HasArrayILShift(Protocol):
+    """Protocol for array classes that support the in-place left shift operator."""
+
+    def __ilshift__(self, other: Self | int, /) -> Self:
+        """Calculates the in-place left shift for each element of an array instance with the respective element of the array other.
+
+        Args:
+            other: operand array. Must be compatible with self (see Broadcasting). Should have an integer data type.
+
+        Returns:
+            self, after performing the in-place left shift.
+
+        """  # noqa: E501
+        ...
+
+
 class HasArrayRShift(Protocol):
     """Protocol for array classes that support the right shift operator."""
 
@@ -586,6 +602,7 @@ class Array(
     HasArrayXOr,
     HasArrayIXor,
     HasArrayLShift,
+    HasArrayILShift,
     HasArrayRShift,
     HasArrayLT,
     HasArrayLE,