feat: support history, norms and goals for LLM

ref: N25B-299

src/control_backend/schemas/llm_prompt_message.py

@@ -0,0 +1,7 @@
+from pydantic import BaseModel
+
+
+class LLMPromptMessage(BaseModel):
+    text: str
+    norms: list[str]
+    goals: list[str]