Merge pull request #7203 from murgatroid99/node_separate_health_check

package.json

src/node/health_check/LICENSE

src/node/health_check/health.js

src/node/health_check/node_modules/grpc.js

src/node/health_check/package.json

src/node/health_check/v1/health_grpc_pb.js

src/node/health_check/v1/health_pb.js

src/node/test/health_test.js

templates/package.json.template

templates/src/node/health_check/package.json.template