Added ValueBuffer implementation and simple recording

ValueBuffer is now the default buffer object for storing data for
recording and processing purposes, a simple recording implementation has
been done, core.py example starts recording as soon as the core has
started then on exit it saves the output as a csv file through the
ValueBuffer export_csv method

test/manual/peer.py

@@ -116,24 +116,12 @@ def value_sender_thread(
 
                 next_send_time += period
 
-            value = ValueDescriptor(
-                signal_id=signal_id, value=2.0, timestamp=monotonic_ns()
-            )
-
-            message = ValueBatch(
-                values=[
-                    value,
-                    value,
-                    value,
-                    value,
-                    value,
-                    value,
-                    value,
-                    value,
-                    value,
-                    value,
-                ]
-            )
+            message = ValueBatch(values=[])
+            for i in range(10):
+                value = ValueDescriptor(
+                    signal_id=signal_id, value=2.0, timestamp=monotonic_ns()
+                )
+                message.values.append(value)
 
             future = asyncio.run_coroutine_threadsafe(
                 send_message(