I tried this way, but I found it cannot make `Class.attribute` assignable. With this solution, in the example below, pyright reports an incompatible type error in line 3.

```python
class Entity(Base):
    __tablename__ = 'entity'
    column_1: AttrAnnotation[Column, int] = Column('column_1', BIGINT(unsigned=True), primary_key=True, autoincrement=True)
#  ^ Expression of type "Column[int]" cannot be assigned to declared type "AttrAnnotation[Column[Unknown], int]"
#      "Column[int]" is incompatible with "AttrAnnotation[Column[Unknown], int]"
```

Does anyone still have any idea?
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