Support ADURL detector

[DominicOram]

Following from #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 #1213 (comment), 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

[coretl]

This is an ADURL driver rather than an ADAravis driver. This needs support adding to ophyd_async.

[DominicOram]

This is an ADURL driver rather than an ADAravis driver. This needs support adding to ophyd_async.

Thanks, we can take a look at adding that.

[DominicOram]

Thanks, we can take a look at adding that.

We've actually managed to use the ContAcqDetector for this instead (#1227). I will leave this open as I guess a more specific ADURL detector may be useful for the future but will not carry on working on it.

[jwlodek]

Were you able to resolve the first frame issue with the continuous acquisition detector?

[DominicOram]

Were you able to resolve the first frame issue with the continuous acquisition detector?

No, I'm continuing to investigate but we were seeing that on a ADAravis detector so I don't think it affects the decision to not write the ADURL support for now