Tweak import macro bootstrap to trick rust analyzer aspect

[hlopko]

In #1166 we discovered that rust analyzer aspect doesn't understand the _with_import_macro_bootstrapping_mode rule. This PR changes the rule to pretend to be more like a normal Rust rule.

CC @cfredric

[hlopko]

The alias_with_import_macro_bootstrapping_mode is not expected to be used anywhere else. I see it as a private rule, and implementation detail. Vast majority of users should not have to know about it, and if somebody is looking there, it's likely because they are investigating something and they are trying to understand what's going on.

We intentionally omitted the docs attributes so this rule doesn't pollute our docs pages. But now that I'm thinking about it it's not the presence of docs, but explicit configuration in bzl files in //docs that matters for what is shown on docs pages. Therefore I'll add docs in the morning :)

[UebelAndre]

Sweet! I'll await docs

[UebelAndre]

@hlopko is there anything more than docs this is waiting on?

[hlopko]

That, tests, and also I think I'll re-do the PR to add support for aliases into rust analyzer tooling (currently alias is not traversed), and then I'm change the transitioning rules to mimic alias (name of the attribute will be actual).

[hlopko]

This is now ready for another review, please take a look :)

[UebelAndre]

Looking good! Just some nits 😅

[UebelAndre]

I'm not entirely sure what happened here: https://buildkite.com/bazel/rules-rust-rustlang/builds/5705#1fa56c67-7d6d-407a-b50c-aa78c5327cf1
There was a timeout but as far as I can tell the timeout should be 15 minutes and the build only ran for 11... I'll dig more into this but I highly suspect a rebuild will fix it (since that's what happened to me).

Done.

[UebelAndre]

Awesome! Thank you!