added support of inputs parameters that are recognised by the API.

Models are now loaded in separate endpoints for the inputs to be easier to recognise

samples/models/dummy/config.json

@@ -1,3 +1,6 @@
 {
-  "type": "dummy"
+  "type": "python",
+  "file": "model.py",
+
+  "inputs": {}
 }

samples/models/dummy/model.py

@@ -0,0 +1,12 @@
+import json
+import typing
+
+
+def load(model) -> None:
+    pass
+
+def unload(model) -> None:
+    pass
+
+def infer(model) -> typing.Iterator[bytes]:
+    yield json.dumps({"hello": "world!"}).encode("utf-8")