Consider adding no_wildcard_variable_uses to core

[pq]

See: dart-lang/sdk#51221

/fyi @munificent

[natebosch]

We can't come up with a meaningful name automatically, but would it be worthwhile to try to find a pattern to have a fix with an automatic rename to something non-meaningful (localVar, argument1) or semi-meaningful (maybe a heuristic on the type or something else)?

I think I lean towards not trying to add a fix, I can't recall what portion of our current core set has a fix.

I am in favor of adding this lint to the core set whether we add a fix or not - but if we may add a fix we should hold off on adding it to the core set until we implement it.

[devoncarew]

This is approved for the core set.

[devoncarew]

This lint requires 3.1, which the package currently doesn't set as its minimum.