Get all available avatar groups from HeyGen with pagination.

Args: include_public: Whether to include public avatar groups (default: False) limit: Number of avatar groups to return (1-100, default: 20) offset: Number of avatar groups to skip (default: 0)

Returns: Paginated list of avatar groups with their properties and pagination metadata.

Response format: { "success": true, "data": { "avatar_groups": [ { "avatar_group_id": "...", "avatar_group_name": "...", "avatars": [...] } ], "pagination": { "total": 10, "limit": 20, "offset": 0, "count": 10, "has_more": false } } }