Added model serializer for ORMS

[nxexox]

Added ModelSerializer for different ORMs.
Example:

from rest_framework import serializers


class ExampleModel(OrmModelClass):
 field_one = OrmCharFIeld(required=True, field_arg=1) . # etc


class ExampleModelSerializer(serializers.Serializer):
 class Meta:
 model = ExampleModel
 fields = ('field_one',)

# FROM OBJECT TO JSON
obj = ExampleModel(field_one='123')
ser = ExampleModelSerializer(instance=obj)
print(ser.data)
# {"field_one": "Field One"}

# FROM JSON TO OBJECT
ser = ExampleModelSerializer(data={'field_not_valid_name': None})
ser.is_valid()
print(ser.errors)
# {'field_one': 'This field is required.'}