Add schema support for `ArrayField`

[ghost]

Looks like it's not implemented right now. Would love to have this supported. Thoughts?

[bhch]

I'll have to think about this.

Meanwhile, you can override the schema using a custom form:

# models.py
class MyModel(...):
    my_array = ArrayField(...)


# forms.py
class MyModelForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Provide custom schema
        self.fields['my_array'].widget.schema = {'type': 'array', ...}


# admin.py
class MyAdmin(admin.ModelAdmin):
    form = MyModelForm

...

[dongyuzheng]

I am @ghost