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8108f838 - [red-knot] feat: add `StringLiteral` and `LiteralString` comparison (#13634)

[red-knot] feat: add `StringLiteral` and `LiteralString` comparison (#13634) ## Summary Implements string literal comparisons and fallbacks to `str` instance for `LiteralString`. Completes an item in #13618 ## Test Plan - Adds a dedicated test with non exhaustive cases --------- Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>