[wip][improve][broker] Supports assigning bundles to a given broker

[lordcheng10]

Motivation

Supports assigning bundles to a given broker.

1. Write the corresponding allocation scheme on zk through a command;
2. When the bundle is unloaded, at the time of allocation, the bundle will be allocated to the specified broker according to the allocation scheme on zk.

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Matching PR in forked repository

PR in forked repository: https://github.com/lordcheng10/pulsar/pull/30

[heesung-sohn]

From my understanding, this PR is trying to achieve a bundle-level isolation policy.

Ref: https://pulsar.apache.org/docs/administration-isolation/#:~:text=In%20an%20organization%2C%20a%20Pulsar,provide%20high%2Dquality%20messaging%20service.

I think this is worth a PIP to discuss.

[lordcheng10]

From my understanding, this PR is trying to achieve a bundle-level isolation policy.

Ref: https://pulsar.apache.org/docs/administration-isolation/#:~:text=In%20an%20organization%2C%20a%20Pulsar,provide%20high%2Dquality%20messaging%20service.

I think this is worth a PIP to discuss.

OK, I will create a PIP to discuss

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