[Improve][SDK] Optimize the single message processing logic in the EncodeObject class

[gosonzhang]

Description

Currently, a single message is processed through the EncodeObject.bodyBytes field, but in actual use, the bodylist field can be reused to save and process[1]

In order to reduce repeated implementation logic, this issue is used for implementation optimization

1. https://github.com/apache/inlong/blob/master/inlong-sdk/dataproxy-sdk/src/main/java/org/apache/inlong/sdk/dataproxy/codec/EncodeObject.java#L38

InLong Component

InLong SDK

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

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