Supporting no-code Guardrail creation (#2636)

* feat: support to define a guardrail task no-code

* feat: add auto-discovery for Guardrail code execution mode

* feat: handle malformed or invalid response from CodeInterpreterTool

* feat: allow to set unsafe_mode from Guardrail task

* feat: renaming GuardrailTask to TaskGuardrail

* feat: ensure guardrail is callable while initializing Task

* feat: remove Docker availability check from TaskGuardrail

The CodeInterpreterTool already ensures compliance with this requirement.

* refactor: replace if/raise with assert

For this use case `assert` is more appropriate choice

* test: remove useless or duplicated test

* fix: attempt to fix type-checker

* feat: support to define a task guardrail using YAML config

* refactor: simplify TaskGuardrail to use LLM for validation, no code generation

* docs: update TaskGuardrail doc strings

* refactor: drop task paramenter from TaskGuardrail

This parameter was used to get the model from the `task.agent` which is a quite bit redudant since we could propagate the llm directly

tests/project_test.py

@@ -1,4 +1,5 @@
 from typing import List
+from unittest.mock import patch
 
 import pytest
 
@@ -142,6 +143,15 @@ def test_agent_function_calling_llm():
     ), "agent's function_calling_llm is incorrect"
 
 
+def test_task_guardrail():
+    crew = InternalCrew()
+    research_task = crew.research_task()
+    assert research_task.guardrail == "ensure each bullet contains its source"
+
+    reporting_task = crew.reporting_task()
+    assert reporting_task.guardrail is None
+
+
 @pytest.mark.vcr(filter_headers=["authorization"])
 def test_before_kickoff_modification():
     crew = InternalCrew()