[Resources.Azure] Rename AddAppServiceDetector to AddAzureAppServiceDetector

[joegoldman2]

I wonder if the method ResourceBuilder.AddAppServiceDetector should be renamed to AddAzureAppServiceDetector to follow the naming convention of other methods which begin with AddAzure (like AddAzureContainerAppsDetector).

namespace OpenTelemetry.Resources;

public static class AzureResourceBuilderExtensions
{
-    public static ResourceBuilder AddAppServiceDetector(this ResourceBuilder builder);
+    public static ResourceBuilder AddAzureAppServiceDetector(this ResourceBuilder builder);
}

This package is still unstable, so renaming is possible.

[vishweshbankwar]

AddAzureAppServiceDetector sounds good to me. @joegoldman2 - Would you like to submit the PR? cc: @rajkumar-rangaraj