Move consumer protocol types to sans-io crate #428
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This change refactors the consumer protocol types (like MemberMetadata, MemberAssignment) from the broker crate into the sans-io crate. These are protocol-level types that belong with the other protocol serialization code.
The sans-io crate now handles all encoding/decoding of the consumer protocol types independent of IO concerns.
note that this work is to facilitate a rust consumer group client and does not affect the operation of the existing broker consumer group functionality.