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

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

src/WireMock.Net.Shared/Settings/WireMockServerSettings.cs

@@ -338,4 +338,15 @@ public class WireMockServerSettings
     /// </summary>
     [PublicAPI]
     public HandlebarsSettings? HandlebarsSettings { get; set; }
+
+    /// <summary>
+    /// Gets or sets the activity tracing options.
+    /// When set (not null), WireMock.Net will create System.Diagnostics.Activity objects for request processing.
+    /// </summary>
+    /// <remarks>
+    /// To export traces to an OpenTelemetry collector, install the WireMock.Net.OpenTelemetry package
+    /// and configure the exporter using the provided extension methods.
+    /// </remarks>
+    [PublicAPI]
+    public ActivityTracingOptions? ActivityTracingOptions { get; set; }
 }