Updated tests and added core live value handling

Removed useless tests, will need to complete a more comprehensive test
suite however this is not the priority right now

Added a live value dict in the core whose values are populated by the
core's input thread

test/test_json_server.py

@@ -11,7 +11,7 @@ from dynalab_core.protocols.json.errors import (
     JsonServerStartupError,
     JsonServerTimeoutError,
 )
-from dynalab_core.protocols.packets.handshake import ConnectorHello
+from dynalab_core.protocols.packets.handshake import ConnectorHello, SignalDescriptor
 from test.common import find_available_port
 
 
@@ -93,9 +93,7 @@ def test_json_server_logs_invalid_handshake(
                 assert server_hello
                 peer.sendall(b"not-json\n")
 
-                rejection = _wait_for_event(
-                    caplog, "connector.handshake_rejected"
-                )
+                rejection = _wait_for_event(caplog, "connector.handshake_rejected")
         finally:
             core.stop()
 
@@ -116,6 +114,7 @@ def test_json_server_waits_for_connection_handlers_on_stop(
         protocol_version=PROTOCOL_VERSION,
         connector_name="Test connector",
         connector_version="0.1.0-test",
+        signals=[SignalDescriptor(id=uuid4(), name="Dummy signal", type="number")],
     )
 
     with caplog.at_level(logging.DEBUG, logger="dynalab_core"):
@@ -124,9 +123,7 @@ def test_json_server_waits_for_connection_handlers_on_stop(
             with socket.create_connection(("127.0.0.1", port), timeout=1) as peer:
                 peer_file = peer.makefile("rb")
                 assert peer_file.readline()
-                peer.sendall(
-                    connector_hello.model_dump_json().encode("utf-8") + b"\n"
-                )
+                peer.sendall(connector_hello.model_dump_json().encode("utf-8") + b"\n")
                 assert b'"type":"handshake_accepted"' in peer_file.readline()
 
                 core.stop()