Raise (or make configurable) maxWorkflowSize

[kalugny]

Is this a BUG REPORT or FEATURE REQUEST?:
Feature request, bordering on bug
What happened:
My workflows fail because they are "too big". What is the reason for the 1MB limit? Can this be raised or made configurable?

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Argo version:

$ argo version

• Kubernetes version :

$ kubectl version -o yaml

Other debugging information (if applicable):

• workflow result:

$ argo get <workflowname>

• executor logs:

$ kubectl logs <failedpodname> -c init
$ kubectl logs <failedpodname> -c wait

• workflow-controller logs:

$ kubectl logs -n kube-system $(kubectl get pods -l app=workflow-controller -n kube-system -o name)

[sarabala1979]

#1264 and #1344 will solve the large workflow and 1MB limits on ETCD