[BUG] Python: creating Configuration disables all HTTP debug logging

This is an offshoot of a bug filed against the Python Kubernetes client (https://github.com/kubernetes-client/python/issues/1530).

Debug mode is disabled automatically in the constructor.
https://github.com/OpenAPITools/openapi-generator/blob/2732c45cc1d0431aa96c91af6476bff9ce36be41/modules/openapi-generator/src/main/resources/python/configuration.mustache#L240

Doing so disables HTTP debug logging for the whole application.
https://github.com/OpenAPITools/openapi-generator/blob/2732c45cc1d0431aa96c91af6476bff9ce36be41/modules/openapi-generator/src/main/resources/python/configuration.mustache#L406-L411

This means that even HTTP requests that have nothing to do with this particular configuration won't be logged anymore. This is neither expected or desirable. Enabling/disabling debug logging should not tamper with the global HTTPConnection.debuglevel setting in any way.

Furthermore, it looks like two separate Configurations will still share their loggers. Consequently, you cannot really have one that has debug disabled and another with debug enabled. Thus it shouldn't be presented as an instance field.

The issues run even deeper. It uses two loggers: "{{packageName}}" and "urllib3". The first can be way too generic and easily conflict with some other library. (For example, the Kubernetes client just ends up with "client".) The latter should not be touched at all, because this package may not be the only thing using urllib3.

I request that the debug property be removed from Configuration entirely. (This would be a breaking change.) Instead, clients should do logging.getLogger('<whatever>').setLevel(logging.DEBUG). If the client wants to enable debug logging for HTTPConnection and/or urllib3, they should do so explicitly themselves. The template should also be fixed to use logging.getLogger(__name__), as is standard practice.

Start with modules/openapi-generator/src/main/resources/python/configuration.mustache, especially the constructor near line 240 and logging setup near lines 406-411. Trace how generated Configuration instances affect HTTPConnection.debuglevel and the named loggers. Done means debug configuration is no longer shared globally or exposed as an instance setting, and the generated module uses its own logger without altering urllib3 logging.