[Prototype] Support ActivityLinks

[pakrym]

Currently, Azure SDKs produce a special kind of Activities that carries links in a

public IEnumerable<Activity> Links { get; }

property.

Migration to ActivitySource based activities would result in the same information being carried in the https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.activity.links?view=net-5.0

This PR add support for collecting both ways of representing links.

[TimothyMothra]

/AzurePipelines run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[pakrym]

cc @lmolkova

[pakrym]

Hey, @TimothyMothra @cijothomas!

We made the change on Azure SDK side to add an experimental ActivitySource support. How can I help you make a decision on this PR?

[TimothyMothra]

/AzurePipelines run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[pakrym]

Test failures seem unrelated.

[TimothyMothra]

/AzurePipelines run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[pakrym]

@rajkumar-rangaraj any news on this? The .NET 5 activity link support has shipped in Azure SDKs

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