Support ADURL detector

Following from https://github.com/bluesky/ophyd-async/issues/1213 the AravisDriverIO seems to not be compatible with older versions of the driver. When trying to connect to these I get: ``` webcam: NotConnectedError: driver: NotConnectedError: trigger_mode: TypeError: BL15J-DI-WEB-01:CAM:TriggerMode_RBV has choices ('Internal', 'External'), but <enum 'OnOff'> requested ['On', 'Off'] to be strictly equal to them. trigger_source: NotConnectedError: read_pv: NotConnectedError: ca://BL15J-DI-WEB-01:CAM:TriggerSource_RBV write_pv: NotConnectedError: ca://BL15J-DI-WEB-01:CAM:TriggerSource ``` as @niamhdougan said at https://github.com/bluesky/ophyd-async/issues/1213#issuecomment-4037933224, this driver is ~6 years old so I'm not sure if the preferred solution is to make the driver backwards compatible or to update the IOC. ## Acceptance Criteria - We can connect to the webcam with `AravisDetector`