feat: enable min/max replica for Server CR #6218
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What this PR does / why we need it:
This PR adds scaffolding code to deal with Min/Max replica for a given server from within the scheduler. This is essentially required for follow-up work to add server autoscaling as part of the system. Work done mostly by @lc525
One particular change is to introduce
TypeinServerStatusResponseto differential between the "normal" flow of server status updates vs. triggered (to follow) for scaling servers up/down.Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
TODO: