grpc-js: Implement pick_first sticky TF and address list shuffling #2511
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This implements the non-xDS parts of gRFC A62. I also took this as an opportunity to simplify some aspects of the pick_first LB policy implementation.
The new tests in
test-pick-first.tsprimarily test how the LB policy responds to connectivity state transitions and address list updates, because I think that's the trickiest part of the behavior. There are also a few tests specifically of the address list randomization functionality.I omitted the environment variable protection for the address list randomization option because I believe it is sufficiently tested by the new tests.