[red-knot] Display raw characters for string literal (#14351)
## Summary
Closes: #14330
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| <img width="693" alt="Screenshot 2024-11-15 at 9 41 09 AM"
src="https://github.com/user-attachments/assets/0d10f2be-2155-4387-8d39-eb1b5027cfd4">
| <img width="800" alt="Screenshot 2024-11-15 at 9 40 27 AM"
src="https://github.com/user-attachments/assets/ba68911c-f4bf-405a-a597-44207b4bde7a">
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## Test Plan
Add test cases for escape and quote characters.
