Users should be able to define their own schema namespace

[DanWertheimer]

Currently, users have their namespace automatically created for them at python.kafka.modelname

py2k/py2k/record.py

Lines 66 to 80 in 14d82e5

	@staticmethod
	def schema_extra(schema: Dict[str, Any],
	model: Type['KafkaRecord']) -> None:
	schema['type'] = 'record'
	schema['name'] = schema.pop('title')
	schema['namespace'] = (f'python.kafka.'
	f'{schema["name"].lower()}')
	schema = process_properties(schema)
	schema.pop('properties')
	# Dynamically generated schemas might not have this field,
	# which is removed anyway.
	if 'required' in schema:
	schema.pop('required')
	update_optional_schema(schema=schema, model=model)

We should allow users to define their own namespace.

something like,

class MyRecord(KafkaRecord):
    name: str
    
    @property
    def namespace():
        return 'my.name.space'

or as an argument to PandasToRecordsTransformer