black: merge config into main pyproject.toml now that we have it This means that naive contributors who just run `black` on a source file will get reasonable behavior as long as they have a recent black. Yay! This was previously D9834 but was rolled back due to test failures. nbjoerg thinks it's time to try again, so let's give it a shot. Differential Revision: https://phab.mercurial-scm.org/D10185

pyproject: add config file This will tell pip et al to call our setup.py for the majority of packaging concerns, but also gives us a place to put standard config stuff like black. This was previously D9833, but was rolled back due to test breakage. nbjoerg thinks that breakage is now resolved, so we're trying again. Differential Revision: https://phab.mercurial-scm.org/D10184

perf-util: add an helper revset to use the same spec as the case search script This make result of the searcher script easier to use. Differential Revision: https://phab.mercurial-scm.org/D10228

perf-helpers: add a search-discovery-case script This a small script I built to look for interesting discovery case. It is fairly basic but could be useful in various situation so lets put it in the main repositories. Differential Revision: https://phab.mercurial-scm.org/D10225

debugdiscovery: add missing byte string marker to some help text This is causing crash when using --help. Differential Revision: https://phab.mercurial-scm.org/D10227

debugdiscovery: also integrate the discovery output in the json one We add a way for formatter to informs code that free output is unwanted, and we incorporate it in the json output. Differential Revision: https://phab.mercurial-scm.org/D10224