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[ty] Preserve delimiters when folding expressions. (#24999)
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## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
This makes it so that we preserve outer delimiters when folding
expressions. For instance:
```py
x = [
1,
2,
3,
]
```
now folds like so in a character-precise LSP client:
```py
x = [...]
```
rather than like so:
```py
x = ...
```
The same behavior applies to parethesized callables, call args, sets,
tuples, comprehensions, type parameter lists, and subscripts.
**I recommend reviewing this diff commit-by-commit.**
Closes https://github.com/astral-sh/ty/issues/3427.
## Test Plan
Please see updated tests.
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