Overhaul socket stubs on Windows and MacOS (#8106)

Reduce the `socket` allowlists for these platforms to a handful of missing constants

stubs/ldap3/ldap3/core/server.pyi

@@ -1,7 +1,10 @@
-from socket import AF_UNIX as AF_UNIX
+import sys
 from typing import Any
 from typing_extensions import Literal
 
+if sys.platform != "win32":
+    from socket import AF_UNIX as AF_UNIX
+
 unix_socket_available: bool
 
 class Server: