This lays the basic groundwork to invoke buck2 in a way that barely works and
builds nothing.
The `jj.bzl` code will be used in some upcoming diffs to add `BUCK` files to the
various crates.
Signed-off-by: Austin Seipp <aseipp@pobox.com>
These are basically always useful in vscode; turn them on. Note that there is an
editorconfig plugin for vscode and we do have a `.editorconfig` file but these
options aren't set due to an old intellj-rust bug.
Signed-off-by: Austin Seipp <aseipp@pobox.com>