grpc-js-xds: Implement aggregate and logical DNS clusters #2343
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This is an implementation of gRFC A37: xDS Aggregate and Logical DNS Clusters. In short, this adds support for aggregate clusters, which provide a list of other clusters to connect to, and logical DNS clusters, which provide a DNS name to connect to. The new tests cover the basic functionality added here, but most are skipped because they fail on Node 16 because of nodejs/node#42713.