Improvement: Add node status

[m-schaeffler]

I'm suggesting to add a node state to show in the node red editor the last received state.

[yoiang]

Hey @m-schaeffler , thank you for the suggestion! There is a previous issues that represents this feature (#6) that ultimately I closed because I figured this would mostly be used for debugging purposes while setting up one's dashboard and mostly duplicates other debugging nodes' functionality.

However if you have a super compelling reason or enough people call for it maybe we should reconsider!