Add CreateCheckStatusResponseAsync APIs

[jviau]

With AspNetCore support via extension in dotnet isolated, customers are unable to use our CreateCheckStatusResponse APIs due to synchronous IO not being allowed by default. While we don't want to add direct AspNetCore support at this time (would require bringing in that extension package, which is a no-go for us without our own separate package). We can in the short term add CreateCheckStatusResponseAsync which will fix the no-sync IO issue.

Issue describing the changes in this PR

resolves #2717

Pull request checklist

• [x] 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
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• [x] I have added all required tests (Unit tests, E2E tests)
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  • [ ] Otherwise: major or minor version updates are reflected in /src/Worker.Extensions.DurableTask/AssemblyInfo.cs
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• [ ] My changes should be added to v3.x branch.
  • [x] Otherwise: This change only applies to Durable Functions v2.x and will not be merged to branch v3.x.

[jviau]

Will update release notes before checking in (just waiting on another PR to avoid a merge conflict)