feat(headless): Allow for INPUTS customizations via settings

[mecampbellsoup]

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[mecampbellsoup]

These class overrides need to inherit from allauth.headless.inputs, we can document that.

[mecampbellsoup]

Here's an example I'm using locally:

from allauth.headless.account.inputs import RequestPasswordResetInput
from django.http import HttpRequest

from cloud_console.django.apps.webauth.models import User


class RequestPasswordResetInput(RequestPasswordResetInput):
    def save(self, request: HttpRequest, **kwargs):
        # Only users w/ passwords can request to reset their password
        if self.users:
            email = self.cleaned_data["email"]
            try:
                user = User.objects.get(email=email)
            except User.DoesNotExist:
                return email
            else:
                if not user.has_usable_password():
                    return email
        return super().save(request, **kwargs)

Here is how I configure my settings:

HEADLESS_INPUTS = {
    "reset_password": "cloud_console.django.apps.webauth.inputs.RequestPasswordResetInput"
}

[coveralls]

coverage: 95.827% (+0.002%) from 95.825%
when pulling fca5686 on mecampbellsoup:mc/headless/inputs-customizations
into ef8743c on pennersr:main.

[pennersr]

Closing -- as mentioned, headless inputs are just a private implementation detail that is best not exposed publically.