fix(#2729) improve split array processor support nested field

[yanfeng1992]

Purpose

#2729
improve split array processor support nested field

Remarks

PR introduces (a) breaking change(s): <yes/no>

PR introduces (a) deprecation(s): <yes/no>

[dominikriemer]

Hi @yanfeng1992 thanks for the PR!
Since the changes also affect the description, we should also add a migration to make sure existing pipelines using the old model are properly updated.
You can take a look at the MsTeamsSinkMigration as an example and I'm happy to help if you have any questions.

[github-actions]

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[github-actions]

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