core/recommended lints to support wildcard variables

[pq]

Hey all.

As we wrap up analyzer support for wildcards, we've got some open questions about how we want the linter to behave to support (and nudge folks towards idiomatic use of) wildcards. What opinions would you all like to see enforced in the core or recommended sets?

Feel free to chime in here or https://github.com/dart-lang/sdk/issues/56595

Thanks!