wireprotov2: add TODOs around extending changesetdata fields Extensions will inevitably want to extend the set of changeset data/fields that can be requested. We'll need to implement support for extending this in the future. Add some TODOs to track that. Differential Revision: https://phab.mercurial-scm.org/D4487

exchangev2: fetch and apply bookmarks This is pretty similar to phases data. We collect bookmarks data as we process records. Then at the end we make a call to the bookmarks subsystem to reflect the remote's bookmarks. Like phases, the code for handling bookmarks is vastly simpler than the previous wire protocol code because the server always transfers the full set of bookmarks when bookmarks are requested. We don't have to keep track of whether we requested bookmarks or not. Differential Revision: https://phab.mercurial-scm.org/D4486

wireprotov2: add bookmarks to "changesetdata" command Like we did for phases, we want to emit bookmarks data attached to each changeset. The approach here is very similar to phases: we emit bookmarks data inline with requested revision data. But we emit records for nodes that weren't requested as well so consumers have access to the full set of defined bookmarks. Differential Revision: https://phab.mercurial-scm.org/D4485