Add OTEL tracing support for Wiremock + automatic OTEL for Aspire integration (#1418)

* Update aspire to 13.1 (examples + code)

Allows usage of aspire CLI which is very useful for dev in codespaces (for my next PR).

* Add OTEL support

* Initial PR feedback

* PR feedback

* PR feedback

* PR feedback

* Cleanup.

* Cleanup

* Fix

* Fix

* Rename stuff around to be more accurate

* PR feedback

* Update WireMock.Net.OpenTelemetry.csproj

Update <Authors>

* PR feedback parser

* PR feedback package versions

* Status code feedback.

* Update preprocessor directives to to Activity Tracing instead of OpenTelemetry. Is more descriptive.

* Add tests

* Improve tests

---------

Co-authored-by: Stef Heyenrath <Stef.Heyenrath@gmail.com>

src/WireMock.Net/WireMock.Net.csproj

@@ -37,4 +37,9 @@
         <ProjectReference Include="../WireMock.Net.GraphQL/WireMock.Net.GraphQL.csproj" />
         <ProjectReference Include="../WireMock.Net.ProtoBuf/WireMock.Net.ProtoBuf.csproj" />
     </ItemGroup>
+
+    <!-- OpenTelemetry exporter for .NET 6+ -->
+    <ItemGroup Condition="'$(TargetFramework)' == 'net6.0' or '$(TargetFramework)' == 'net7.0' or '$(TargetFramework)' == 'net8.0'">
+        <ProjectReference Include="..\WireMock.Net.OpenTelemetry\WireMock.Net.OpenTelemetry.csproj" />
+    </ItemGroup>
 </Project>