Make some progress on accounts

src/primaite/simulator/domain/controller.py

@@ -0,0 +1,13 @@
+from typing import Set, TypeAlias
+
+from primaite.simulator.core import SimComponent
+from primaite.simulator.domain import Account
+
+__temp_node = TypeAlias()  # placeholder while nodes don't exist
+
+
+class DomainController(SimComponent):
+    """Main object for controlling the domain."""
+
+    nodes: Set(__temp_node) = set()
+    accounts: Set(Account) = set()