feat: more flexible scaling with `replicasPerScaleUp` and `replicasPe… #1097

Job	Run time
Build binaries	6m 3s
build-rust-amd64	4m 14s
build-rust-arm64	5m 15s
Build & push linux/amd64 and linux/arm64 (numaflow)	2m 7s
Bom	57s
Release	28s
	19m 4s

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