Support typing.annotated

# Feature request

### Context

This works:

```py
class ClassicMemberItem(Model):
id2: str = Field(default_factory=lambda: 'm1id')

m1 = ClassicMemberItem() # id=ObjectId('6a13e2017c4eef33beb24616') id2='m1id'
```

This does not work:

```py
from typing import Annotated

class ClassicMemberItem2(Model):
id2: Annotated[str, Field(default_factory=lambda: 'm2id')]

m2 = ClassicMemberItem2() # ValidationError: 1 validation error for ClassicMemberItem2
```

However, `typing.annotated` is supported by Pydantic.

Start by reproducing the two ClassicMemberItem examples and inspect how Model processes Field metadata from annotations. Compare the working assignment form with typing.Annotated handling, then verify that the Annotated form constructs successfully and applies the default_factory value without a validation error.

Written by the indexing model from the issue text.