grpc-js: Fix a crash when grpc.keepalive_permit_without_calls
is set
#2519
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Part of the change in #2513 added a trace line to starting the keepalive timer. That can be called from the constructor if the option
grpc.keepalive_permit_without_calls
is set, and that fails because the object isn't fully constructed. This change just rearranges the constructor so that the parts of the setup that affect trace logs are completed as early as possible, and starting the keepalive timer happens as late as possible.