docs: RFC to Allow blocking NodePool disruption and consolidation via external health signals

[vaietc]

Fixes #2497

Description

This adds a few proposed paths to control disruption and consolidation actions via external health signals. Currently, this change only includes an initial RFC and does not dive into implementation details yet. As the feedback progresses, I will add more information on specific changes within the code base.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[GnatorX]

Thanks for cutting the RFC! I will try to read through this

[vaietc]

Apologies, I had to clone this through a common fork my organization has created. New verison is here: #2901