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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"`. This was discovered through DataStax Java Driver 4.19.x tests that attach a `request-id` to queries via custom payload. The same issue affects any CQL client that sets the `CUSTOM_PAYLOAD` flag. 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 Reported on 2026.2, backport. Closes scylladb/scylladb#30005 * github.com:scylladb/scylladb: cql: fix request-side custom payload parsing test/cqlpy: add tests for request-side custom payload handling