Export health-check messages

[doochik]

To use in serviceMap.

Before

const grpcHealthCheck = require('grpc-health-check');
const grpcHealthCheckMessages = require('grpc-health-check/v1/health_pb');
const statusMap = {
    '': grpcHealthCheckMessages.HealthCheckResponse.ServingStatus.SERVING,
};
const healthImpl = new grpcHealthCheck.Implementation(statusMap);
server.addService(grpcHealthCheck.service, healthImpl);

After

const grpcHealthCheck = require('grpc-health-check');
const statusMap = {
    '': grpcHealthCheck.messages.HealthCheckResponse.ServingStatus.SERVING,
};
const healthImpl = new grpcHealthCheck.Implementation(statusMap);
server.addService(grpcHealthCheck.service, healthImpl);

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Aleksei Androsov (ab09c55)

[murgatroid99]

Thank you for your contribution.

[murgatroid99]

I have published this in version 1.8.0

[doochik]

Thanks!