feat: enable excluding refs search results in test
## Change
Here I introduce a new `ReferenceCategory::Test` type to indicate whether the function where this reference is located is marked as `#[test]`, and expose an config item (`rust-analyzer.references.excludeTests`) to client.
I also changed the signature of `ReferenceCategory::new`, adding a `sema: &Semantics<'_, RootDatabase>` param to do some hir analysis. Hope the current implementation is good to go.
## Demo
`"rust-analyzer.references.excludeTests": false`
`"rust-analyzer.references.excludeTests": true`
close https://github.com/rust-lang/rust-analyzer/issues/14530
This commit also adds `tracing` to NotificationDispatcher/RequestDispatcher,
bumps `rust-analyzer-salsa` to 0.17.0-pre.6, `always-assert` to 0.2, and
removes the homegrown `hprof` implementation in favor of a vendored
tracing-span-tree.
feat: "Normalize import" assist and utilities for normalizing use trees
- Add import/use tree normalization utilities
- Add "normalize import" assist
- Update "merge imports" assist to always apply to the covering use item except for nested use tree selections
- Update "merge imports" assist to avoid adding unnecessary braces when merging nested use tree selections
See [this discussion](https://github.com/rust-lang/rust-analyzer/pull/16372#discussion_r1457244321) for the motivation for the new "normalize import" assist and changes to the "merge imports" assist.
feat: Support for GOTO def from *inside* files included with include! macro
close#14937
Try to implement goto def from *inside* files included with include! macro.
This implementation has two limitations:
1. Only **one** file which calls include! will be tracked. (I think multiple file be included is a rare case and we may let it go for now)
2. Mapping token from included file to macro call file (semantics.rs:646~658) works fine but I am not sure is this the correct way to implement.
