feat: Add more helpers to bytecode bridge

Author: PerfectSlayer

dd-java-agent/agent-bootstrap/src/main/java/datadog/trace/bootstrap/instrumentation/api/Java8BytecodeBridge.java

@@ -29,4 +29,9 @@ public static Context getContextFrom(Object carrier) {
   public static Context detachContextFrom(Object carrier) {
     return Context.detachFrom(carrier);
   }
+
+  /** @see AgentSpan#fromContext(Context) */
+  public static AgentSpan spanFromContext(Context context) {
+    return AgentSpan.fromContext(context);
+  }
 }

dd-java-agent/instrumentation/servlet/request-2/src/main/java/datadog/trace/instrumentation/servlet2/Servlet2Advice.java

@@ -1,5 +1,6 @@
 package datadog.trace.instrumentation.servlet2;
 
+import static datadog.trace.bootstrap.instrumentation.api.Java8BytecodeBridge.spanFromContext;
 import static datadog.trace.bootstrap.instrumentation.decorator.HttpServerDecorator.DD_SPAN_ATTRIBUTE;
 import static datadog.trace.instrumentation.servlet2.Servlet2Decorator.DECORATE;
 
@@ -97,7 +98,7 @@ public static void stopSpan(
     if (scope == null) {
       return;
     }
-    final AgentSpan span = AgentSpan.fromContext(scope.context());
+    final AgentSpan span = spanFromContext(scope.context());
 
     if (response instanceof HttpServletResponse) {
       DECORATE.onResponse(