Support default_factory on primary keys of schemas for create routes

[daxxog]

Pydantic has a way to specify a function that provides a default value for a field.

This pull request adds support for this in fastapi-crudrouter, for primary keys that utilize this.

Example:

from secrets import choice
from pydantic import BaseModel, Field
from fastapi import FastAPI
from fastapi_crudrouter import MemoryCRUDRouter as CRUDRouter

class Potato(BaseModel):
    id: int = Field(default_factory=lambda: choice(range(0,3)))
    color: str
    mass: float

app = FastAPI()
app.include_router(CRUDRouter(schema=Potato))

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Name	Status	Preview	Updated
fastapi-crudrouter	✅ Ready (Inspect)	Visit Preview	Jan 11, 2023 at 1:32PM (UTC)

[awtkns]

@daxxog thanks for this! Sorry for the delay. Would you be willing to add a test or two for this prior to merging?

[daxxog]

@awtkns Sure I can do that!

[daxxog]

@awtkns Is this along the lines of what you are looking for? 8000bac

[daxxog]

@awtkns Is this along the lines of what you are looking for? 8000bac

@awtkns Disregard my previous comment. I ran coverage and realized my diff to the tests wasn't even covering my feature. I got the tests to actually run against my feature, and then discovered a few issues, which I fixed.