Need best practices for constructing GRPC clients documented or in samples

Using just node as a client for now I messed around with changing the parameters to GrpcClient creation to see how helpful it was when something was not done right

1. Incorrect TLS Cert for peer in org2 when communicating to peer in org1

Error: 14 UNAVAILABLE: No connection established
    at Object.callErrorFromStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/call.js:31:26)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client.js:179:52)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:336:141)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:299:181)
    at /home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/call-stream.js:145:78
    at processTicksAndRejections (internal/process/task_queues.js:79:11) {
  code: 14,
  details: 'No connection established',
  metadata: Metadata { internalRepr: Map {}, options: {} }

2. invalid hostname

Error: 14 UNAVAILABLE: Name resolution failed for target dns:localhost2:7051
    at Object.callErrorFromStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/call.js:31:26)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client.js:179:52)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:336:141)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:299:181)
    at /home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/call-stream.js:145:78
    at processTicksAndRejections (internal/process/task_queues.js:79:11) {
  code: 14,
  details: 'Name resolution failed for target dns:localhost2:7051',
  metadata: Metadata { internalRepr: Map {}, options: {} }

3. invalid port

Error: 14 UNAVAILABLE: No connection established
    at Object.callErrorFromStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/call.js:31:26)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client.js:179:52)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:336:141)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:299:181)
    at /home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/call-stream.js:145:78
    at processTicksAndRejections (internal/process/task_queues.js:79:11) {
  code: 14,
  details: 'No connection established',
  metadata: Metadata { internalRepr: Map {}, options: {} }

4. incorrect grpc override

Error: 14 UNAVAILABLE: No connection established
    at Object.callErrorFromStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/call.js:31:26)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client.js:179:52)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:336:141)
    at Object.onReceiveStatus (/home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:299:181)
    at /home/dave/github-mine/fabric-gateway/samples/node/node_modules/@grpc/grpc-js/build/src/call-stream.js:145:78
    at processTicksAndRejections (internal/process/task_queues.js:79:11) {
  code: 14,
  details: 'No connection established',
  metadata: Metadata { internalRepr: Map {}, options: {} }

5. peer endpoint set to 'www.microsoft.com:7051'
   Application just hangs

It may or may not be possible to improve some of these responses as this is purely down to Grpc for node, but I think at least we should have a timeout for a grpc connection via the waitForReady api ?

Start with the Node client in samples/node and the GrpcClient creation parameters described in the issue. Review how the sample handles TLS certificates, hostnames, ports, gRPC overrides, and waitForReady behavior. Done means the relevant best practices and connection timeout behavior are documented or demonstrated in samples, where supported.