feat: Add inlay hint for exclusive ranges
Adds an inlay hint containing a '<' character to exclusive range expressions and patterns that specify an upper bound.

Inspired by [this comment](https://github.com/rust-lang/rust/issues/37854#issuecomment-1865124907) noting that IntelliJ Rust has this feature.
fix: try obligation of `IndexMut` when infer
Closes#15842.
This issue arises because `K` is ambiguous if only inferred from `Index` trait, but is unique if inferred from `IndexMut`, but r-a doesn't use this info.
fix: Correctly set and mark the proc-macro spans
This slows down analysis by 2-3s on self for me unfortunately (~2.5% slowdown)
Noisy diff due to two simple refactoring in the first 2 commits. Relevant changes are [7d762d1](7d762d18ed) and [1e1113c](1e1113cf5f) which introduce def site spans and correct marking for proc-macros respectively.
fix: Update metavariable expression implementation
Fixes https://github.com/rust-lang/rust-analyzer/issues/16154
This duplicates behavior of that before and after PR https://github.com/rust-lang/rust/pull/117050 based on the toolchain version. There are some 1.76 nightlies that are still broken (any before that PR basically) but fetching and storing the commit makes little sense to me (opposed to the toolchain version).
fix(mbe): desugar doc correctly for mbe
Fixes#16110.
The way rust desugars doc comments when expanding macros is rendering it as raw strings delimited with hashes. Rust-analyzer wasn't aware of this, so the desugared doc comments wouldn't match correctly when on the LHS of macro declarations.
This PR fixes this by porting the code used by rustc:
59096cdad0/compiler/rustc_ast/src/tokenstream.rs (L662-L671)
Fixes#16110.
The way rust desugars doc comments when expanding macros
is rendering it as raw strings delimited with hashes.
Rust-analyzer wasn't aware of this, so the desugared doc
comments wouldn't match correctly when on the LHS of macro
declarations.
This PR fixes this by porting the code used by rustc: 4cfdbd328b/compiler/rustc_ast/src/tokenstream.rs (L6837)