fix: Update json features supported by xGrammar (#30390)

Signed-off-by: Johannes Flommersfeld <johannes.flommersfeld@tngtech.com>
Signed-off-by: Johannes F <johannesflommersfeld@users.noreply.github.com>
Co-authored-by: Johannes Flommersfeld <johannes.flommersfeld@tngtech.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

tests/v1/entrypoints/conftest.py

@@ -76,6 +76,8 @@ def sample_json_schema():
         },
         "required": ["name", "age", "skills", "grade", "email", "work_history"],
         "additionalProperties": False,
+        "minProperties": 1,
+        "maxProperties": 10,
     }
 
 
@@ -96,6 +98,9 @@ def unsupported_json_schema():
         },
         "required": ["score", "tags"],
         "additionalProperties": False,
+        "patternProperties": {
+            "^score$": {"type": "integer"},
+        },
     }