ObsAcrossEncounter Widgets - control datetime format and display encounter provider name

Improve ObsAcrossEncounter widget in order to be possible to control the datetime format for date column (widget default) and also have the possibility to display the encounter provider name.

Maybe the widget app configuration could have something like:

• showDateWithTime -> show encounterDate with time componente
• datetimeFormat -> specify the datetime format, if we don't put a specific format, it will try to get the GP with datetime format (from UiFramework).
• showEncounterProviderName -> show the encounter providers

_{"config" : {
     ...
   "showDateWithTime" : "True",}

  _{"datetimeFormat" : "dd-mm-yyyy HH:mm",}          

  _{"showEncounterProviderName" : "True"}

_},