Adding ADF V2 SDK

[hvermis]

Description

This SDK is for the new Azure Data Factory V2 platform/service,
which lives side-by-side with the existing "V1" GA service.
code generated based on Azure/azure-rest-api-specs#1703

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• I have read the contribution guidelines.
• The pull request does not introduce breaking changes.

General Guidelines

• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

SDK Generation Guidelines

• If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.
• The generate.cmd file for the SDK has been updated with the version of AutoRest, as well as the commitid of your swagger spec or link to the swagger spec, used to generate the code.
• The *.csproj and AssemblyInfo.cs files have been updated with the new version of the SDK.

[msftclas]

@hvermis,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[shahabhijeet]

Please address this issue before you next commit
#3726