[red-knot] PEP 695 type aliases (#14357)

## Summary

Add support for (non-generic) type aliases. The main motivation behind
this was to get rid of panics involving expressions in (generic) type
aliases. But it turned out the best way to fix it was to implement
(partial) support for type aliases.

```py
type IntOrStr = int | str

reveal_type(IntOrStr)  # revealed: typing.TypeAliasType
reveal_type(IntOrStr.__name__)  # revealed: Literal["IntOrStr"]

x: IntOrStr = 1

reveal_type(x)  # revealed: Literal[1]

def f() -> None:
    reveal_type(x)  # revealed: int | str
```

## Test Plan

- Updated corpus test allow list to reflect that we don't panic anymore.
- Added Markdown-based test for type aliases (`type_alias.md`)

Bump version to 0.7.4 (#14358)

Bump version to 0.7.3 (#14197)

generate using cargo-dist

Bump version to 0.7.1 (#13913)

Changelog for Ruff v0.7 (#13794)

Co-authored-by: Dhruv Manilawala <[email protected]>

Bump version to 0.6.9 (#13624)

Bump version to 0.6.8 (#13522)

Bump version to v0.6.7 (#13439)

Bump version to v0.6.6 (#13415)