when a reactive charm is built with `charm build .` the resulting artifact has a file in the top level with the title `.build.manifest` This file is generated by the `charm` snap and lists the commit hash for each charm layer, installed pip from the wheelhouse 1) It seems when i build a reactive charm using the charmcraft reactive plugin, this file is missing from the `.charm` artifact. 2) it would also be REALLY nice if the `manifest.yaml` generated would also list the `charmtool-version` used to build the charm. the plugin can determine this version by running `/snap/bin/charm version --format json` and extracting the output