Search for geographic targeting locations.
Args:
query: Search term for locations (e.g., "New York", "California", "Japan")
access_token: Meta API access token (optional - will use cached token if not provided)
location_types: Types of locations to search. Options: ['country', 'region', 'city', 'zip',
'geo_market', 'electoral_district']. If not specified, searches all types.
limit: Maximum number of results to return (default: 25)
Returns:
JSON string containing location data with key, name, type, and geographic hierarchy information