[improve] [broker] support load placement based on different dimensions

[aloyszhang]

Fixes #21174

Motivation

Make sure brokers will read a balanced state when using UnifromLoadShedder

Modifications

1. Add new placement strategy: UniformLoadManagerStrategy which support load placement base on
   • long-term msgRate or msgThroughput
   • short-term msgRate or msgThroughput
2. Keep compatible with the exist configuration loadBalancerLoadPlacementStrategy=org.apache.pulsar.broker.loadbalance.impl.LeastLongTermMessageRate
3. Support dynamically configurable for all these placement strategies
4. Add a test to cover this change

Verifying this change

• Make sure that the change passes the CI checks.

Documentation

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PR in forked repository:aloyszhang#20

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