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[ty] support type aliases in binary compares (#20445)

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## Summary

Add missing `Type::TypeAlias` clauses to `infer_binary_type_comparison`.

## Test Plan

Added mdtests that failed before.
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Carl Meyer 2025-09-17 00:33:26 -07:00 • committed by GitHub
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crates/ty_python_semantic/resources/mdtest/pep695_type_aliases.md
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@ -137,6 +137,18 @@ from ty_extensions import is_equivalent_to, static_assert
static_assert(is_equivalent_to(Y, A | B | C | D))
```
## In binary ops
```py
from typing import Literal
type X = tuple[Literal[1], Literal[2]]
def _(x: X, y: tuple[Literal[1], Literal[3]]):
reveal_type(x == y) # revealed: Literal[False]
reveal_type(x < y) # revealed: Literal[True]
```
## `TypeAliasType` properties
Two `TypeAliasType`s are distinct and disjoint, even if they refer to the same type