merlimat opened a new pull request #9148:
URL: https://github.com/apache/pulsar/pull/9148
### Motivation
Third part of implementation for PIP-45:
* Added listener that can be added to the store
* Defined `MetadataCache` that acts as an object cache on top of the data
store
* Added `LocalMemoryMetadataStore` as a reference implementation that can
be used in tests.
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