Enhance get/filter/all function to exclude config_contexts

[sirtux]

As per https://nautobot.readthedocs.io/en/latest/rest-api/overview/#excluding-config-contexts,
by default the full config_context is included in any response unless ?exclude=config_context is explicitly set.

I'd like to have the option in pynautobot to set this option for all get and filter requests against the API.

The most beautiful way would be a global setting when instantiating a pynautobot instance, like with threading,
and the possibility to override it for a specific call if needed.