style: Remove wildcard imports

[epage]

This is based on review feedback from #4551.

I experimented with a clippy.toml file for "blessing" some of these, like errors, but for some reason I wasn't able to get it to work.

[djc]

Thanks!

[rami3l]

LGTM modulo one question: does this change include common exceptions such as super::* in inline tests, or foo::prelude::*? I think we still want those to be excluded.

[epage]

By default there are exceptions, from https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_imports

Wildcard imports are allowed from modules that their name contains prelude. Many crates (including the standard library) provide modules named “prelude” specifically designed for wildcard import.

Wildcard imports reexported through pub use are also allowed.

use super::* is allowed in test modules. This is defined as any module with “test” in the name.

These exceptions can be disabled using the warn-on-all-wildcard-imports configuration flag.

[djc]

I guess this needs a rebase? Lot of issues in the merge queue CI.

[epage]

Rebased