[AETHER-38] Extract pipeline-dependent code from current T3 implementation

- Exposes some ofdpa specific tables and types
- Introduces a new driver behavior PipelineTraceable
- OfdpaPipelineTraceable is the first implementation of the
  new driver behavior
- New abstractions are introduced to encapsulate the input/output
  of the traceables processing
- Implements some basic unit tests for Ofdpa implementation

Change-Id: I89d3fdeda445983ec7ebfa9ebb78afb1c6d3fd8f
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/PipelineTraceable.java b/core/api/src/main/java/org/onosproject/net/behaviour/PipelineTraceable.java
new file mode 100644
index 0000000..eff59db
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/PipelineTraceable.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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
+ *
+ *     http://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 org.onosproject.net.behaviour;
+
+import org.onosproject.net.PipelineTraceableInput;
+import org.onosproject.net.PipelineTraceableOutput;
+import org.onosproject.net.driver.HandlerBehaviour;
+
+/**
+ * Represents a driver behavior that enables a logical packet to trace existing flows and groups in a device.
+ */
+public interface PipelineTraceable extends HandlerBehaviour {
+
+    /**
+     * Initializes the traceable with a context required for its operation.
+     */
+    void init();
+
+    /**
+     * Applies pipeline processing on the given ingress state.
+     *
+     * @param input the input of the apply process
+     * @return the output of the apply process
+     */
+    PipelineTraceableOutput apply(PipelineTraceableInput input);
+
+}