Enhancing search for multiple publishers

[Luckey-Elijah]

When searching for package I would like to be able to search multiple publishers in a single query.

Currently we can only search one like publisher:dart.dev.

I would like the ability search across publishers, similar to the platform: and sdk: prefixes when searching within multiple platforms or SDKs.

For example, if one want to search across all dart team packages I'd write the search query like this:

publisher:dart.dev publisher:tools.dart.dev publisher:labs.dart.dev