Add new channel and add some existing orgs to the network.

[nkaramolegos]

Hello, if I use these helm charts to deploy my network, how can I extend my existed network? For example If I need to add a second channel (which will be joined by all the existing orgs) and deploy a new chaincode to this channel (or update the chaincode of an old channel). Can I do that somehow?

Finally, the gateway client functionality can also be deployed to k8s?