fix(rust) ensure brackets are balanced within attributes #4237
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Fixes #4032.
Changes
Rust attributes can contain nested brackets, braces, and parentheses. This PR adds sub-modes for these nested delimiter groups, ensuring that attribute matches ends only when nested square brackets and other delimiters are balanced.
Syntax reference: The Rust Reference: Attributes. (The actual set of recognized bracket types is derived from DelimTokenTree which is defined in Macros).
Checklist
CHANGES.md