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1af677dff5
When a CQL client sends a request with the CUSTOM_PAYLOAD flag (0x04)
set, the frame body starts with a [bytes map] before the message.
Scylla never implemented parsing of this map on the request side.
This caused it to fail parsing with protocol errors such as
"truncated frame: expected 65546 bytes".
Fix this by skipping over the custom payload [bytes map] from the frame
body before dispatching to opcode-specific handlers. The payload
contents are discarded since Scylla has no pluggable QueryHandler.
Cassandra's default QueryHandler also discards them.
Fixes SCYLLADB-745
(cherry picked from commit f9e8518776)