Add vector-sets module

The vector-sets module is a part of Redis Core and is available by default,
just like any other data type in Redis.

As a result, when building Redis from the source, the vector-sets module
is also compiled as part of the Redis binary and loaded at server start-up.

This new data type added as a preview currently doesn't support
all the capabilities in Redis like:
32-bit OS
C99
Short-read that might end with memory leak
AOF rewirte
defrag

modules/vector-sets/examples/cli-tool/cli.py

@@ -1,3 +1,11 @@
+#
+# Copyright (c) 2009-Present, Redis Ltd.
+# All rights reserved.
+#
+# Licensed under your choice of the Redis Source Available License 2.0
+# (RSALv2) or the Server Side Public License v1 (SSPLv1).
+#
+
 #!/usr/bin/env python3
 import redis
 import requests