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4729: Hover actions r=matklad a=vsrs This PR adds a `hoverActions` LSP extension and a `Go to Implementations` action as an example:  4748: Add an `ImportMap` and use it to resolve item paths in `find_path` r=matklad a=jonas-schievink Removes the "go faster" queries I added in https://github.com/rust-analyzer/rust-analyzer/pull/4501 and https://github.com/rust-analyzer/rust-analyzer/pull/4506. I've checked this PR on the rustc code base and the assists are still fast. This should fix https://github.com/rust-analyzer/rust-analyzer/issues/4515. Note that this does introduce a change in behavior: We now always refer to items defined in external crates using paths through the external crate. Previously we could also use a local path (if for example the extern crate was reexported locally), as seen in the changed test. If that is undesired I can fix that, but the test didn't say why the previous behavior would be preferable. Co-authored-by: vsrs <vit@conrlab.com> Co-authored-by: Jonas Schievink <jonasschievink@gmail.com> Co-authored-by: Jonas Schievink <jonas.schievink@ferrous-systems.com>
