Rework the proc_lib_hack

It is completely removed for connection processes, because
assuming Cowboy is written properly this should bring us
nothing anymore in 2.0.

It is reworked for request processes, there we want to
always propagate the stacktrace (including for exits)
because we will print a report to help with debugging
and proc_lib doesn't propagate it for exits.

At the same time the initial callback for connection
and request processes has been changed to connection_process
and request_process, which should help with identifying
processes when inspecting.

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