grpc-js: Implement ORCA server-side per-call metrics #2978
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This implements the server-side per-call metrics part of gRFC A51. This adds the channel option
grpc.server_call_metric_recordingwhich enables the feature on the server, and adds thegetMetricsRecordermethod to thecallobject that is passed to each method handler. The metrics recorder object has the exact API described in the gRFC.This feature is the first instance of an xds proto being used in the core library, and they need to be published in the library. I already had those protos available in a submodule in the
grpc-js-xdsdirectory, so I added a pre-build script to copy the relevant files into thegrpc-jsdirectory.