[DataFactory]Supported Dataflow flowlets in ADF

[Jingshu923]

swagger pr: Azure/azure-rest-api-specs#16251

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[archerzz]

Some optional parameters are added in-the-middle, which causes breaking changes. Need to provide customization of corresponding methods/constructors.

[archerzz]

@Jingshu923 Thanks. I thought the PR is from a forked repo.