Refactor: Add plan_functions to new PlanModel #1729

class Plan(BlueapiBaseModel):
    """
    A plan that can be run
    """

    name: str = Field(description="Referenceable name of the plan")
    description: str | None = Field(
        description="Description/docstring of the plan", default=None
    )
    model: type[BaseModel] = Field(
        description="Validation model of the parameters for the plan"
    )
    func: PlanGenerator = Field(description="The plan function to be run")

    def to_dict(self) -> dict[str, Any]:
        return {
            "name": self.name,
            "parameter_schema": self.model.model_json_schema(),
            "description": self.description,
        }

    def build_parameters(self, json_params: Mapping[str, Any]) -> dict[str, Any]:
        param_model = self.model.model_validate(json_params)
        prepared_params = {
            field: getattr(param_model, field)
            for field in param_model.__pydantic_fields__
        }
        return prepared_params

    def __call__(self, json_params: Mapping[str, Any]) -> MsgGenerator:
        p = self.build_parameters(json_params)
        return self.func(**p)