[BitSail-458][Connector] Fix RocketMQ Source Get Start Offset

[liuxiaocs7]

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• Title: [BitSail-458][Connector] Fix RocketMQ Source get start offset

• Fixes: #458

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Verifying this change

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• [X] This change is a trivial rework/code cleanup without any test coverage.

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  • com.bytedance.bitsail.core.EngineTest#testRunEngine

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  • Added unit tests for parsing of configs
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Documentation

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[liuxiaocs7]

@lichang-bd PTAL, thx.