Auto merge of #16298 - riverbl:exclusive-range-hint, r=Veykril

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.

![2024-01-07-095056_257x415_scrot](d6bbc0de-52a5-4af4-b53c-a034749b6cab)

Inspired by [this comment](https://github.com/rust-lang/rust/issues/37854#issuecomment-1865124907) noting that IntelliJ Rust has this feature.

crates/hir-def/src/body/lower.rs

@@ -17,7 +17,7 @@ use smallvec::SmallVec;
 use syntax::{
     ast::{
         self, ArrayExprKind, AstChildren, BlockExpr, HasArgList, HasAttrs, HasLoopBody, HasName,
-        SlicePatComponents,
+        RangeItem, SlicePatComponents,
     },
     AstNode, AstPtr, SyntaxNodePtr,
 };