Add perfetto support for scratch memory (#303)

* Add perfetto support for scratch memory

* Updated tests and docs.

* Update docs data

* Added underflow check

* Record all free events to 0 bytes

* Add format

* Address review comment

* updated tests for scratch memory

* update scratch-memory tests.

tests/scratch-memory-tracing/validate.py

@@ -232,6 +232,8 @@ def test_scratch_memory_tracking(input_data):
         assert "operation" in node
         assert "handle" in node["queue_id"]
 
+        assert "allocation_size" in node
+
         assert node["start_timestamp"] > 0
         assert node["start_timestamp"] < node["end_timestamp"]