Merge pull request #5327 from yang-g/v1alpha_to_v1

doc/health-checking.md

src/csharp/Grpc.HealthCheck.Tests/HealthClientServerTest.cs

src/csharp/Grpc.HealthCheck.Tests/HealthServiceImplTest.cs

src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.nuspec

src/csharp/Grpc.HealthCheck/Health.cs

src/csharp/Grpc.HealthCheck/HealthGrpc.cs

src/csharp/Grpc.HealthCheck/HealthServiceImpl.cs

src/csharp/generate_proto_csharp.sh

src/node/health_check/health.js

src/proto/grpc/health/v1/health.proto

src/python/grpcio_health_checking/grpc/health/v1/__init__.py

...python/grpcio_health_checking/grpc/health/v1/health.proto

src/python/grpcio_health_checking/grpc/health/v1/health.py

src/ruby/.rubocop.yml

src/ruby/pb/README.md

src/ruby/pb/generate_proto_ruby.sh

src/ruby/pb/grpc/health/checker.rb

src/ruby/pb/grpc/health/v1/health.rb

src/ruby/pb/grpc/health/v1/health_services.rb

src/ruby/spec/pb/health/checker_spec.rb