[Blueprints, 04-multicluster] New blueprint for Multicluster configuration

[carlosrodlop]

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What is the outcome that you are trying to reach?

Deploying 3 EKS clusters: 1 for the OC, 1 for Controllers and 1 for Agents

https://docs.cloudbees.com/docs/cloudbees-ci/latest/setup/multiple-clusters
https://docs.cloudbees.com/docs/cloudbees-ci/latest/cloud-admin-guide/deploying-agents-separate-cluster

Describe the solution you would like

Describe alternatives you have considered

Additional context