patches on message support on top of history

[dtam]

short circuits on="messages" to on="msg_history" to add use and use many support for the 6x interface

to test

from pydantic import BaseModel, Field
from guardrails.async_guard import AsyncGuard

class Pet(BaseModel):
    name: str = Field(description="a unique pet name")

def custom_llm(*args, **kwargs):
    raise Exception(
        "LLM was called when it should not have been!"
        "Input Validation did not raise as expected!"
    )

guard = AsyncGuard.from_pydantic(output_class=Pet)
guard.use(TwoWords(on_fail=on_fail), on="messages")
    await guard(
        custom_llm,
        messages=[
            {
                "role": "user",
                "content": "What kind of pet should I get?",
            }
        ],
    )

should raise a validation error