Add an easy way to change `extra =` meta option

[sobolevn]

Right now all models allow extra fields:

django-ninja-jwt/ninja_jwt/schema.py

Line 100 in 2fb51bf

# extra = "allow"

I don't want that behavior, I want to be strict on my input types: no extras are allowed in authentication.
So, how to change that?

Now I have to change all settings in

NINJA_JWT = {
  'TOKEN_OBTAIN_PAIR_INPUT_SCHEMA': "custom",
  'TOKEN_OBTAIN_PAIR_REFRESH_INPUT_SCHEMA': "custom",
  'TOKEN_VERIFY_INPUT_SCHEMA': "custom",
}

To only change one configuration option.

I would like to see something like:

NINJA_JWT = {
  'SCHEMAS_EXTRA': 'forbid',  # with 'allow' as default for backward-compat
}

See https://docs.pydantic.dev/latest/api/config/#pydantic.config.ConfigDict.extra

[eadwinCode]

@sobolevn Sorry for the late response, reason #123

I think this is related to #117 I will look at this feature over the weekend

[eadwinCode]

@sobolevn I think you inherit from the existing schema and change the model_config then have the schema referenced in the setting like so:

NINJA_JWT = {
  'TOKEN_OBTAIN_PAIR_INPUT_SCHEMA': "path.to.the.schema.with.a.different.model_config",
  'TOKEN_OBTAIN_PAIR_REFRESH_INPUT_SCHEMA': "custom",
  'TOKEN_VERIFY_INPUT_SCHEMA': "custom",
}

[sobolevn]

This is exactly what I did. And it seems very verbose for just a simple bool switch.