Distributed Tracing for Entities (Isolated)

[sophiatev]

This PR adds support for distributed tracing for entities in the .NET isolated framework. The changes mostly focus on correctly propagating information between the durabletask and durabletask-dotnet repos. In order to do so, the proto definition of objects related to signaling entities or entities starting orchestrations had to be populated with extra information (like the parent trace context of the request, or the time of the request, etc. For more details see this PR in the protobuf repo). The changes in the ProtobufUtils class focus on adding this extra information. The changes in LocalGrpcListener are to:

• Create a trace in the case of a client signaling an entity
• Add the parent trace context created for a client starting an orchestration to the corresponding ExecutionStartedEvent, because I noticed that traces were not correctly being created in this case otherwise (this change is unrelated to tracing for entities).

The various other PRs related to this effort are

• durabletask-dotnet
• protobuf
• durabletask

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation PR is ready to merge and referenced in pending_docs.md
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)
• My changes do not require any extra work to be leveraged by OutOfProc SDKs
  • Otherwise: That work is being tracked here: #issue_or_pr_in_each_sdk
• My changes do not change the version of the WebJobs.Extensions.DurableTask package
  • Otherwise: major or minor version updates are reflected in /src/Worker.Extensions.DurableTask/AssemblyInfo.cs
• My changes do not add EventIds to our EventSource logs
  • Otherwise: Ensure the EventIds are within the supported range in our existing Windows infrastructure. You may validate this with a deployed app's telemetry. You may also extend the range by completing a PR such as this one.
• My changes should be added to v2.x branch.
  • Otherwise: This change applies exclusively to WebJobs.Extensions.DurableTask v3.x. It will be retained only in the dev and main branches and will not be merged into the v2.x branch.