Add instructions/feature to run a single node with an open RPC endpoint

[chrisdotn]

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What is the outcome that you are trying to reach?

The CDK consists of two main constructrs, the single-node and the ha-rpc-nodes-with-alb, which are meant to be used together. As such, the single node creates snapshots and isn't accessible by default from the outside. It would be nice to have an option to create a single node only without the need for the rpc nodes. This would be good for development purposes, where I'd need a node connected to one of the testnets, but would not need the full-blown HA features of the full CDK deployment.

Describe the solution you would like

• An option to deploy an rpc node only
• The RPC endpoint should be easily accessible form the outside.
• It should not create snapshots on a regular basis

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[github-actions]

Issue closed due to inactivity.