Add GraphQL tracer integration for AppSignal monitoring

- Add tracer parameter to Ash.Query.for_read calls in GraphQL resolvers
- Enables proper AppSignal tracing for GraphQL operations
- Works with Scribble.Telemetry.AppsignalAshGraphql for descriptive span names

Closes: AppSignal tracing for GraphQL operations

Author: lukegalea

documentation/topics/monitoring.md

@@ -12,7 +12,7 @@ A tracer can be configured in the domain. It will fallback to the global tracer
 
 ```elixir
 graphql do
-  trace MyApp.Tracer
+  tracer MyApp.Tracer
 end
 ```
 

lib/graphql/resolver.ex

@@ -369,7 +369,8 @@ defmodule AshGraphql.Graphql.Resolver do
           |> Ash.Query.for_read(action, %{},
             actor: opts[:actor],
             domain: domain,
-            authorize?: AshGraphql.Domain.Info.authorize?(domain)
+            authorize?: AshGraphql.Domain.Info.authorize?(domain),
+            tracer: AshGraphql.Domain.Info.tracer(domain)
           )
           |> load_fields(
             [
@@ -492,7 +493,8 @@ defmodule AshGraphql.Graphql.Resolver do
                    |> Ash.Query.for_read(action, %{},
                      actor: Map.get(context, :actor),
                      domain: domain,
-                     authorize?: AshGraphql.Domain.Info.authorize?(domain)
+                     authorize?: AshGraphql.Domain.Info.authorize?(domain),
+                     tracer: AshGraphql.Domain.Info.tracer(domain)
                    ),
                  query <-
                    load_fields(

test/read_test.exs

@@ -1629,4 +1629,19 @@ defmodule AshGraphql.ReadTest do
              } = result
     end
   end
+
+  test "domain tracer configuration is correctly retrieved" do
+    # Create a test domain with tracer configuration
+    defmodule TestDomainWithTracer do
+      use Ash.Domain,
+        extensions: [AshGraphql.Domain]
+
+      graphql do
+        tracer MyApp.Tracer
+      end
+    end
+
+    # Verify that the tracer configuration is correctly retrieved
+    assert AshGraphql.Domain.Info.tracer(TestDomainWithTracer) == [MyApp.Tracer]
+  end
 end