Python CDK: create a way to indicate a stream's default namespace

[sherifnada]

Tell us about the problem you're trying to solve

The Python CDK does not expose an ergonomic way of declaring a stream's namespace.

For example, a class which extends Stream can declare the property primary_key which declares that stream's primary key in the catalog output by that connector. I would similarly like a way to declare the namespace for a stream e.g here is an example of declaring the PK in a stream from Stripe:

class StripeStream(HttpStream, ABC):
    url_base = "https://api.stripe.com/v1/"
    primary_key = "id"

Describe the solution you’d like

I would like to declare the namespace of the stream similarly:

class StripeStream(HttpStream, ABC):
    url_base = "https://api.stripe.com/v1/"
    primary_key = "id"
    namespace = "my_namespace"

This blocks #12491

[sherifnada]

closed by #13923