feat: add compute_unit_per_broker and storage_unit_per_bookie

[maxsxu]

Motivation

The compute_unit and storage_unit are actually "per broker" or "per bookie" rather than "total". so rename to avoid confuse.

Modifications

• Add compute_unit_per_broker and storage_unit_per_bookie

• Deprecate compute_unit and storage_unit

• Update docs

Verifications

Will show following warnings:

╷
│ Warning: Argument is deprecated
│ 
│   with streamnative_pulsar_cluster.test-cluster-2,
│   on main.tf line 23, in resource "streamnative_pulsar_cluster" "test":
│   23:   compute_unit     = 0.3
│ 
│ Deprecated. Please use compute_unit_per_broker instead.
│ 
│ (and 3 more similar warnings elsewhere)