Changes to Create a scorer

added the new selected_stages enum value to the scope_mode response property for the response status 201

added the new optional request property stages

added the new selected_stages enum value to the request property scope_mode

added the required property stages to the response with the 201 status

api tag factory-scorers added

api tag factory removed

the request property agent_config/default_runner_uid became not nullable

the request property agent_config/mcp_servers became not nullable

the request property agent_config/secrets became not nullable

the request property allowed_classifications/items/description became not nullable

the request property description became not nullable

the request property sampling_rate became not nullable

endpoint added