revlog: skip opener options to pass debug_delta value We can directly set the option in the config object now.

revlog: skip opener options to pass candidate_group_chunk_size value We can directly set the option in the config object now.

revlog: skip opener option to pass delta_both_parents value We can directly set the option in the config object now.

revlog: skip opener option to pass chunk_cache_size value We can directly set the option in the config object now.

revlog: create the revlog object at the repository level There is currently no value set in it, but we will be able to start centralise config parsing at the repository level.

revlog: overwrite revlog config through copy of the config object The new objects allow for this kind of blanket approach that make things cleaner. If we have more cases, it would probably deserve a context manager, but since we only have two usage, I don't think it is worth it.

revlog: move configuration attribute into dedicated object First this make things clearer as the number of configuration attributes has grown out of control, so gathering them make things clearer. Second, this will make future sharing them at different level simpler. Third it will allow us to make initialisation and temporary override simpler soon.