chore: add test dependencies

pyproject.toml

@@ -24,5 +24,14 @@ dependencies = [
     "presidio-anonymizer>=2.2.355",
 ]
 
+[project.optional-dependencies]
+test = [
+    "pytest>=8.2.0",
+    "pytest-asyncio>=0.23.6",
+    "pytest-cov>=5.0.0",
+    "pytest-xdist>=3.1.0",
+    "hypothesis>=6.122.1"
+]
+
 [tool.setuptools]
 py-modules = ["guardrails_genie"]