option to force unique names

currently some entities (eg path) get automatically numbered in case of duplicates.

There should be an option to force unique names using `x-kong-name` directives to prevent too many updates when pushing changes

No file or test is named in the issue. Start by locating the converter logic that automatically numbers duplicate entities such as paths, then trace how OpenAPI x-kong-name directives are read; done means those directives can force stable unique names and avoid unnecessary updates when changes are pushed.

Written by the indexing model from the issue text.