Add TLA+ spec for core concurrency of spec#484
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This PR comes out of the blue, but I think it could be useful.
It adds a TLA+ spec for what I think is the core concurrent part of the spec: the transaction and connection lifecycle.
As background: I am involved in the efforts at Servo to implement the latest spec, and I found how the above is specified to be quite ambiguous at first. Once you've internalized the spec and thought about it, I think it all makes sense, but the benefit of expressing this in TLA+ is that it abstracts away everything else and provides you with an unambiguous description of the concurrent part that a machine can check.
Note sure how to integrate this in the actual spec; maybe via a note and a link to the file in the repo?
For your consideration.