Add snippet for enabling diagnostic stack traces (#712)

* Add snippet for enabling diagnostic stack traces

Demo how to enable diagnostic stack traces in Jetpack Compose for improved debugging.

The snippet shows how to conditionally enable `ComposeStackTraceMode.Auto` in the `Application.onCreate` method for debug builds, while keeping it disabled in release builds to avoid performance overhead.

* Apply Spotless

* Set to use Auto, no debug toggle

* Apply Spotless

* For debug, use SourceInformation, otherwise Auto

* Apply Spotless

* Remove duplicate copyright

* Switch back from alpha BOM

* Update to new recommendations

* Add super call

* Apply Spotless

* Add comment about enabling stacktraces at onCreate level

---------

Co-authored-by: riggaroo <9973046+riggaroo@users.noreply.github.com>

Author: riggaroo

compose/snippets/src/main/java/com/example/compose/snippets/performance/Stacktraces.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.compose.snippets.performance
+
+import android.app.Application
+import androidx.compose.runtime.Composer
+import androidx.compose.runtime.tooling.ComposeStackTraceMode
+
+// [START android_compose_stacktraces_enable]
+// Enable stack traces at application level: onCreate
+class SampleStackTracesEnabledApp : Application() {
+
+    override fun onCreate() {
+        super.onCreate()
+        // Enable Compose stack traces for minified builds only.
+        Composer.setDiagnosticStackTraceMode(ComposeStackTraceMode.Auto)
+
+        // Alternatively:
+        // Enable verbose Compose stack traces for local debugging
+        Composer.setDiagnosticStackTraceMode(ComposeStackTraceMode.SourceInformation)
+    }
+}
+// [END android_compose_stacktraces_enable]