Begin transition to new fields for JsonProject crate cfgs

This starts the transition to a new method of documenting the cfgs that are
enabled for a given crate in the json file.  This is changing from a list
of atoms and a dict of key:value pairs, to a list of strings that is
equivalent to that returned by `rustc --print cfg ..`, and parsed in the
same manner by rust-analyzer.

This is the first of two changes, which adds the new field that contains
the list of strings.  Next change will complete the transition and remove
the previous fields.

0 files changed, 0 insertions, 0 deletions