revlog: remove legacy usage of `_generaldelta` All core code is now getting the setting from the DeltaConfig object.

revlog: use the new Config classes in _testrevlog the mock object need to follow the new interface. We allow ourself a small hacky import since this is testing code. The legacy attribute are still here because some code still use them. We will drop them when this code is updated.

revlog: skip opener options to pass sparse reading values We can directly set the option in the config object now.

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

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

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

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

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

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

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

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

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.

manifestrevlog: flag some inconsistency in bundle/union repo inheritance This "work" but still, this is weird, let us point it out.

randomaccessfile: drop explicit passing of file description The goal of this object is to manage IO, we still have to open the file if necessary, but this is all internal now.

revlog: drop more file description passing between private function They are no longer used as we are covered by the `reading` context

revlog: use a `reading` context in `_enforceinlinesize` We are about to enforce reading context on various operation, so we make sure top level method are in the right context. In the future we might move the responsibility of opening the revlog for reading higher in the call chain but lets limit the disruption for now.

revlog: drop the df argument to `sidedata` The intend of this argument is better filled by the `revlog.reading` or `revlog._writing` context. So we drop it to leave rooms for further cleanup and improvements.

revlog: drop the df argument to `rawdata` The intend of this argument is better filled by the `revlog.reading` or `revlog._writing` context. So we drop it to leave rooms for further cleanup and improvements.