Investigate if `DistributedContextPropagator` can be used to avoid injecting and extracting context in instrumentation libraries

[vishweshbankwar]

Feature Request

Starting .NET6.0 DistributedContextPropagator is added to System.Diagnostics.DiagnosticSource. Opening this issue to investigate if we can avoid context injection and extraction in HttpClient and ASP.NET Core instrumentations respectively and have libraries set the correct context based on the default propagator set by user in SDK. If possible, this will help reduce the overhead of extracting and injecting context twice (first in instrumented library i.e. ASP.NET Core \ HttpClient and then in instrumentation library) when the default propagator is not TraceContextPropagator.