Changes to Import Asset Data

removed the enum value "CUSTOM_FIELD" from the query request parameter unique_field_type

removed the enum value "DEFAULT_FIELD" from the query request parameter unique_field_type

removed the enum value "MERGE" from the query request parameter conflict_resolution

removed the enum value "SKIP" from the query request parameter conflict_resolution

added the new enum value CUSTOM_FIELD to the query request parameter unique_field_type

added the new enum value DEFAULT_FIELD to the query request parameter unique_field_type

added the new enum value MERGE to the query request parameter conflict_resolution

added the new enum value SKIP to the query request parameter conflict_resolution