[Bug] Support represent null in ReadonlyConfig

[ruanwenjun]

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What happened

I find when I translate a Config to ReadonlyConfig, the null will be translate to "" in ReadonlyConfig.

This is due to below code.

e.g. If we have a : null in Config, it will be transform to "a=" in properties, then we split by '=', the value will be "".

SeaTunnel Version

dev

SeaTunnel Config

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• Yes I am willing to submit a PR!

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