Parse triple quoted string annotations as if parenthesized (#15387)

## Summary

Resolves #9467 

Parse quoted annotations as if the string content is inside parenthesis.
With this logic `x` and `y` in this example are equal:

```python
y: """
   int |
   str
"""

z: """(
    int |
    str
)
"""
```

Also this rule only applies to triple
quotes([link](https://github.com/python/typing-council/issues/9#issuecomment-1890808610)).

This PR is based on the
[comments](https://github.com/astral-sh/ruff/issues/9467#issuecomment-2579180991)
on the issue.

I did one extra change, since we don't want any indentation tokens I am
setting the `State::Other` as the initial state of the Lexer.

Remaining work:

- [x] Add a test case for red-knot.
- [x] Add more tests.

## Test Plan

Added a test which previously failed because quoted annotation contained
indentation.
Added an mdtest for red-knot.
Updated previous test.

Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>
Co-authored-by: Micha Reiser <micha@reiser.io>

crates/ruff_python_parser/src/parser/mod.rs

@@ -74,7 +74,9 @@ impl<'src> Parser<'src> {
     /// Consumes the [`Parser`] and returns the parsed [`Parsed`].
     pub(crate) fn parse(mut self) -> Parsed<Mod> {
         let syntax = match self.mode {
-            Mode::Expression => Mod::Expression(self.parse_single_expression()),
+            Mode::Expression | Mode::ParenthesizedExpression => {
+                Mod::Expression(self.parse_single_expression())
+            }
             Mode::Module | Mode::Ipython => Mod::Module(self.parse_module()),
         };