Conditions on Basic Types (Strings)

### Problem Description:

Rune allows attaching conditions directly to basic type aliases (e.g., `typeAlias BusinessCenter: string condition IsValid`). The Python generator does not yet support wrapping simple types to trigger these validators upon assignment.

### Steps to Reproduce:
Example Rune code: (Type alias with condition)
```rosetta
typeAlias Currency:
string

condition C:
item count = 3
```

1. Define a `typeAlias` on a basic type (string, number, etc.) with an attached `condition`.
2. Generate Python code and check the Pydantic field definition for the alias.

### Expected Result:
The assignment should be intercepted and validated according to the condition.

### Actual Result:
No validation occurs as the type is treated as a plain Python `str`.