Rollup merge of #147444 - jyn514:fully-qualified-paths, r=nnethercote

Allow printing a fully-qualified path in `def_path_str`

Previously, the local crate would always be printed as a leading `crate::`. Allow resolving it to the crate name instead.

This allows printing a fully qualified path with:
```rust
let qualified_name = with_no_visible_paths!(with_resolve_crate_name!(
    with_no_trimmed_paths!(tcx.def_path_str(def_id))
));
```

I found this useful for an out-of-tree rustc-driver. I do not currently have a usecase in mind upstream; I'm ok if you don't want this PR for that reason. See [#t-compiler/help > print a fully qualified path name? @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/print.20a.20fully.20qualified.20path.20name.3F/near/541560961) for additional context.

This does not currently have tests. I am not aware of an easy way to test def-id printing, since it requires having access to a TyCtxt.

Author: matthiaskrgr