Additions

• Files and Buckets
• Expression evaluation for pipeline operators
• File handling operations to simplify file upload/download via ubiops.utils

Changes

• Move role_assignments_per_user_list to role_assignments_per_object_list
• Change role_assignments_create body to assignee_type+assignee and resource_type+resource
• Remove gpu_type for DeploymentInstanceType
• Add retries for deployment request response
• Add restart_request_interruption for deployment versions
• Add static_ip to deployment version list