Use a single edge WebSocket per placeos-core node

[github-actions]

Currently, a single WebSocket per edge on a core is opened.
These connections can be multiplexed netting a small perf boost.

rest-api/src/placeos-rest-api/controllers/edges/connection_manager.cr

Lines 5 to 10 in aa815ec

	# Edge Connection Management
	#
	# Handles the websocket proxy between Edge and Core
	#
	# TODO: Use a single socket per core
	class Edges::ConnectionManager