grpc / grpc-java / 13877

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api: Rename NameResolver.Observer to Listener2

This follows the sort of changes we've done in the past, where the '2'
implies "version 2." We can end up reclaiming the original name if we
wish in the future.

The main reason for this change is to avoid changing to Observer since
the rest of io.grpc consistently uses Listener.

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