Support lazy signals in get_device_info()
Description
This MR introduces a fix to the issue described in #458
Related Issues
Closes #458
Additional Comments
For the test I used EpicsSignal, as it can be created, but not connected to. Please check and let me know if you prefer an alternative way to test. It was the most simple and straight forward case imo.
Definition of Done
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Documentation is up-to-date.