refactor: refactor message handling and encoding in queue system

[appleboy]

• Remove Encode method call in BenchmarkQueue function
• Add TaskMessage interface extending QueuedMessage with Payload method
• Rename Payload field to Body in Message struct
• Add Payload method to Message struct to return Body
• Replace Data field and Encode method in Message struct with Bytes method using JSON marshalling
• Update NewMessage to use Body instead of Payload
• Add documentation for Encode method in job package
• Update TestMessageEncodeDecode to use Payload() method
• Replace Encode method call with direct handling of task in Queue methods
• Change logger from Errorf to Fatalf in Queue error handling
• Add type assertion and handling for job.Message in Queue's run method
• Import job package in ring.go
• Add Data struct with Payload field and Bytes method in ring.go
• Update Ring's Run method to use Data struct for task handling