Add a PingThread to prevent ws channel getting stuck during initialization

[gbhat618]

Testing done

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[jglick]

Why would this be limited to WebSocket transport?

[gbhat618]

Why would this be limited to WebSocket transport?

I think it would be applicable to TCP too, I only tested for WebSocket, so didn't touch the TCP code. I should try with tcp agents and observe the issue once there too (looks like it is easily observed when 300+ agents all connecting in short duration).