This allows specifying multiple IDs in grants via an `ids` field, which
will eventually become the normal way to specify IDs. Internally, each
grant with multiple IDs turns into multiple ACL grants each with a
single ID; to make this distinction clearer and allow for better
separation of concerns an AclGrant type has been introduced, so really
multiple IDs in a Grant turn into multiple AclGrants.
The nice thing about doing it this way is that it becomes purely a
parsing concern; no actual validation logic has changed.
For backwards compatibility with grants already stored in roles, we do
not error out if `id` is specified. However, eventually we will simply
not support grants with `id` coming via the API; they will fail API
validation, such that new grants will require the use of the updated
`ids` field.
A follow-on PR will plumb this through the service handlers/API/CLI, but
I decided to do it in separate chunks to make reviewing easier, given
that they are easily separable into the internal and external aspects of
the change.
* Add CLI/API checks around using ID in grants (#3264)
* Plumb through some contexts to remove a lot of deprecated errors (#3268)
Jeff Mitchell