[hdpowerview] Support refresh command for signal strength channel

[jlaur]

Fixes #11942

Signed-off-by: Jacob Laursen jacob-github@vindvejr.dk

Channel signalStrength was added by #11198 while #11933 refactored the REFRESH command for shades to be relative to channel for requested item. The missing piece now is the signalStrength channel which currently cannot be refreshed on request.

This pull request makes the REFRESH command for shades feature complete as each channel now has a dedicated method assigned for requesting a hard refresh for the item context.

Tested with both negative result:

2022-01-03 00:52:58.796 [TRACE] [rview.internal.HDPowerViewWebTargets] - JSON response = null
2022-01-03 00:52:58.800 [WARN ] [rnal.handler.HDPowerViewShadeHandler] - No response from shade 36321 survey

and positive result:

2022-01-03 00:54:21.764 [INFO ] [openhab.event.ItemCommandEvent      ] - Item 'Blind11_SignalStrength' received command REFRESH
2022-01-03 00:54:40.781 [TRACE] [rview.internal.HDPowerViewWebTargets] - JSON response = {"shade_id":36321,"survey":[{"neighbor_id":17805,"rssi":-86}]}
2022-01-03 00:54:40.783 [DEBUG] [rnal.handler.HDPowerViewShadeHandler] - Survey response for shade 36321: {neighbor:17805, rssi:-86}
2022-01-03 00:54:40.947 [DEBUG] [ternal.handler.HDPowerViewHubHandler] - Updating shade '36321'
2022-01-03 00:54:40.964 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'Blind11_SignalStrength' changed from 0 to 4

[lolodomo]

LGTM