[ty] More precise type inference for dictionary literals (#20523)

## Summary

Extends https://github.com/astral-sh/ruff/pull/20360 to dictionary
literals. This also improves our `TypeDict` support by passing through
nested type context.

crates/ty_python_semantic/resources/mdtest/call/builtins.md

@@ -57,7 +57,7 @@ type("Foo", Base, {})
 # error: [invalid-argument-type] "Argument to class `type` is incorrect: Expected `tuple[type, ...]`, found `tuple[Literal[1], Literal[2]]`"
 type("Foo", (1, 2), {})
 
-# TODO: this should be an error
+# error: [invalid-argument-type] "Argument to class `type` is incorrect: Expected `dict[str, Any]`, found `dict[Unknown | bytes, Unknown | int]`"
 type("Foo", (Base,), {b"attr": 1})
 ```