[FEATURE] add configuration for including the original topic in the metadata when withMetadata is set to true

[nlu90]

Is your feature request related to a problem? Please describe.

Would it be possible to add another configuration element that includes the original topic in the metadata when withMetadata is set to true? So still use GLOBAL_TIME so its single files but in certain cases they may still need to know which topic it came from (but we still want single files) so if it was in the metadata of the written out JSON that would be ideal and wouldn't require us to store it as a property from the beginning.

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