Gemini list as tool call param fix phi 2238 (#1687)

## Description

This PR adds support for tools with input as a list for Gemini 

## Type of change

Please check the options that are relevant:

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Model update
- [ ] Infrastructure change

## Checklist

- [ ] My code follows Phidata's style guidelines and best practices
- [ ] I have performed a self-review of my code
- [ ] I have added docstrings and comments for complex logic
- [ ] My changes generate no new warnings or errors
- [ ] I have added cookbook examples for my new addition (if needed)
- [ ] I have updated requirements.txt/pyproject.toml (if needed)
- [ ] I have verified my changes in a clean environment

phi/model/google/gemini.py

@@ -310,12 +310,19 @@ def format_functions(self, params: Dict[str, Any]) -> Dict[str, Any]:
                 converted_properties = {}
                 for prop_key, prop_value in value.items():
                     property_type = prop_value.get("type")
+                    if property_type == "array":
+                        converted_properties[prop_key] = prop_value
+                        continue
                     if isinstance(property_type, list):
                         # Create a copy to avoid modifying the original list
                         non_null_types = [t for t in property_type if t != "null"]
                         if non_null_types:
                             # Use the first non-null type
                             converted_type = non_null_types[0]
+                            if converted_type == "array":
+                                prop_value["type"] = converted_type
+                                converted_properties[prop_key] = prop_value
+                                continue
                         else:
                             # Default type if all types are 'null'
                             converted_type = "string"