* Use !matching-dist to do any dist searches to remove duplicated
search logic.

* !matching-dist returns a list of matching dists so that it
can serve a wider range of functions. A thin wrapper method
could use this to provide a list of "candidate" distributions
from a specific CUR.

* Take $api into account when searching dists.

* Set all meta<files>.values to absolute paths, not just the one
being searched for.

See:
#1120 (comment)

Add `method candidates` - All distribution searching/resolving go through this new method. This gives developers insight into how a CURI resolves a module request, which was not possible with .resolve (since it would chain to the next CUR, and only returned a single result). Many NYI s22 features will require something like this, and .candidates is indeed mentioned in s22 https://design.perl6.org/S22.html#candidates

!matching-dist is now backed by .candidates, but also caches a single 'best match' so it acts similar to before.
#1121 (comment)

.candidates (i.e. !matching-dist) now returns a Distribution object and not ($dist-id, $dist-data). This is possible because of a new LazyMetaReader role that allows our lazy distribution to avoid costly IO calls to obtain meta data. Previously this was done by passing around a hash internally, but now we dogfood our Distribution interface throughout CURI.

Avoid io after setting up various directories once.