RepodataGateway Reporter - more information

[wolfv]

Following some discussion, some use cases are not so easy right now. In previous versions of rattler-build, we reported one download bar per subdirectory.

And after the download is finished, we reported a Done message that would also show if we were using the cache ("cache hit"). Or if the subdir does not exist, we would show an X.

These informations are currently not available, and as I understand, the shards also complicate the picture because download_start and download_end are called on each shard.

I think it would be nice if the Reporter would group downloads by subdir and had some extra reporting options on download end, e.g. an Enum that shows: NOT_FOUND, CACHE_HIT, DOWNLOADED or something liek that.