Feat/6704 neighbor info on demand #8523
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Closes #6704
Allows you to requestneighbours from a node.
Node needs to have neighbourInfo turned on, but can have the interval set to 0.
Does not need to have sendViaLora == true.
Uses the 'want response' field with neighbor_count == 0 to indicate that it is a request for neighbor info.
This doesn't seem to be being used by anything in neighbor info, but I added the count == 0 to make sure that we don't get into a situation where they just keep responding to each other.
Added an optional 'sendEmpty' param, so that requests are always responded to.
At the moment it's sent to the requesting node, rather than broadcast, but that's open to discussion.