Add skip metadata handling in _QueryMessage

This change restores handling of skip_metadata in _QueryMessage, that
was removed in 2019 (most likely to prevent metadata inconsistencies
in prepared statements).

I'm not sure if any other changes are required, as there were many
modifications in the codebase since the flag handling was removed.

Author: andrzej-jackowski-scylladb

cassandra/protocol.py

@@ -606,6 +606,9 @@ def _write_query_params(self, f, protocol_version):
                     "Keyspaces may only be set on queries with protocol version "
                     "5 or DSE_V2 or higher. Consider setting Cluster.protocol_version.")
 
+        if self.skip_meta is not None and self.skip_meta:
+            flags |= _SKIP_METADATA_FLAG
+
         if ProtocolVersion.uses_int_query_flags(protocol_version):
             write_uint(f, flags)
         else: