aperture-js: Use binary serialization for the aperture.check_response attribute

[krdln]

Json serialization of timestamps has some issues (they're serialized as objects and not strings, as per protojson format) and @harjotgill created a workaround for that, which converts all timestamp fields manually.

aperture/sdks/aperture-js/sdk/flow.ts

Lines 78 to 108 in bce96d9

	// HACK: Change timestamps to ISO strings since the protobufjs library uses it in a different format
	// Issue: https://github.com/protobufjs/protobuf.js/issues/893
	// PR: https://github.com/protobufjs/protobuf.js/pull/1258
	// Current timestamp type: https://github.com/protocolbuffers/protobuf/blob/main/src/google/protobuf/timestamp.proto
	const localCheckResponse = this.checkResponse as any;
	localCheckResponse.start = this.protoTimestampToJSON(
	this.checkResponse.start,
	);
	localCheckResponse.end = this.protoTimestampToJSON(
	this.checkResponse.end,
	);
	localCheckResponse.waitTime = this.protoDurationToJSON(
	this.checkResponse.waitTime,
	);
	// Walk through individual decisions and convert waitTime fields,
	// then add to localCheckResponse, preserving immutability.
	if (this.checkResponse.limiterDecisions) {
	const decisions = this.checkResponse.limiterDecisions.map(
	(decision) => {
	return {
	...decision,
	waitTime: this.protoDurationToJSON(decision.waitTime),
	};
	},
	);
	localCheckResponse.limiterDecisions = decisions;
	}
	this.span.setAttribute(
	CHECK_RESPONSE_LABEL,
	JSON.stringify(localCheckResponse),
	);

An alternative workaround would be to utilize binary serialization instead of json. We can do it because metricsprocessor accepts aperture.check_response as json but also as base64-encoded protowire. This could even result in a performance improvement as a side-effect.

Note: This requires swapping out the generator, as the current one doesn't provide anything like serializeBinary / encode, etc.

Note: If this requires some more effort, let's stay with current workaround.

[DariaKunoichi]

Generated new typescript files from proto using https://www.npmjs.com/package/grpc_tools_node_protoc_ts?activeTab=readme#how-to-use
Currently have a problem with importing those added files - code pushed to branch js_new_proto_gen.
Leaving this task for now.