Define a new NodeInfo type NodeInfoTypePrivateUnstaked

[vishalchangrani]

Problem Definition

What problem is this solving?

Currently, the NodeInfo can be one of three types:
A new type needs to be defined - NodeInfoTypePrivateUnstaked for the unstaked node. Care needs to be taken that this new type which allows for a nil staking key does not introduce any side effects.

Proposed Solution

What are the proposed solutions to this problem?

Definition of Done

What tests must pass for this issue to be considered solved?

Actions Needed Before Submitting

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[vishalchangrani]

observer node already boots up and is able to connect to a staked AN so this would have been implemented already one way or the other.