[Synapse] Add pipeline, linked service, trigger, notebook management cmdlets

[wonner]

Description

This change add pipeline, linked service, trigger, notebook management cmdlets. Here is the commandlet review PR:https://github.com/Azure/azure-powershell-cmdlet-review-pr/issues/694

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
  • the markdown help files have been regenerated using the commands listed here

[adxsdkps]

Can one of the admins verify this patch?

[isra-fel]

Please resolve the conflicts and make sure your PR can build. Thanks

[isra-fel]

1. You may find "Export-AzSynapseNotebook Does not support ShouldProcess but the cmdlet verb Export indicates that it should." in the log of static analysis jobs. Per my understanding, Export-AzSynapseNotebook does not make change on Azure, so you are safe to suppress this error
2. Please write test cases

[isra-fel]

Changing the return type to string would affect InvokeAzureSynapsePipeline.cs, which was designed to return a PSCreateRunResponse

[wonner]

It's a bug need to fix. In the next released package of Artifacts, the return type will be CreateRunResponse.

[idear1203]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[msJinLei]

@wonner Please resolve the conflicts.