* Rename device.py to hub.py
* Rename AxisNetworkDevice to AxisHub
* Move hub.py into hub package
* Rename get_axis_device to get_axis_api
* Split out get_axis_api to its own module
* Rename device object to hub
* Rename device to api in config flow
* Convenience method to get hub
* Add diagnostics support to Axis integration
* Remove system info
* Redact sensitive information
* Store whole config entry
* Redact username
* Apply suggestions from code review
Co-authored-by: Michael <35783820+mib1185@users.noreply.github.com>