Add nonce_increment and wipe functions on typing.

src/aeg/_typing.py

@@ -120,3 +120,7 @@ class Cipher(Protocol):
         maclen: int = ...,
         into: "Buffer | None" = None,
     ) -> bytearray | memoryview: ...
+    @staticmethod
+    def nonce_increment(nonce: "Buffer") -> None: ...
+    @staticmethod
+    def wipe(buffer: "Buffer") -> None: ...