feat: add CapacityBuffer API and a controller to reconcile

[sumukha-radhakrishna]

Based on the RFC - #2571 #2898

Fixes #N/A

Description

How was this change tested?

Applied the resource on the cluster and ensured that the resource exists and is reconciled.

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[DerekFrank]

Excited to see the provisioner tie in! Discussed building a capacity buffers provider that pre-caches all the pods for performance, but we can leave that for prod graduation criteria and out of alpha