Introduce `ConfigExtensionExt`, allowing the propagation of arbitrary `ConfigExtension`s across network boundaries#100

gabotechs merged 7 commits intomaindatafusion-contrib/datafusion-distributed:mainfrom

gabrielmusat/propagate-config-extensionsdatafusion-contrib/datafusion-distributed:gabrielmusat/propagate-config-extensionsCopy head branch name to clipboard