[store] add pybind for get_replica_desc

[yejj710]

Description

• There is a Query funcs in client_service.cpp, which providing query replica_descriptor ability. But I haven't seen a pybind interface that provides this implementation. And I want to query replica_descriptor to do some cache aware route, so i implement it.

Type of Change

• Types
  • [ ] Bug fix
  • [ ] New feature
    • [ ] Transfer Engine
    • [x] Mooncake Store
    • [ ] Mooncake EP
    • [x] Integration
    • [ ] P2P Store
    • [ ] Python Wheel
  • [ ] Breaking change
  • [ ] CI/CD
  • [ ] Documentation update
  • [ ] Other

How Has This Been Tested?

from mooncake.store import MooncakeDistributedStore
store_client = MooncakeDistributedStore()
store_client .setup() # add init config
descriptors = store.get_replica_desc("mooncake_key")
for desc in descriptors:
    print("Status:", desc.status)
    if desc.is_memory_replica():
        mem_desc = desc.get_memory_descriptor()
        print("Memory buffer desc:", mem_desc.buffer_descriptor)
    elif desc.is_disk_replica():
        disk_desc = desc.get_disk_descriptor()
        print("Disk path:", disk_desc.file_path, "Size:", disk_desc.object_size)

Checklist

• [x] I have performed a self-review of my own code.
• [x] I have updated the documentation.
• [x] I have added tests to prove my changes are effective.

[gemini-code-assist[bot]]

Summary of Changes

Hello @yejj710, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Mooncake store's Python integration by providing new functionalities to retrieve replica descriptors. It exposes the AllocatedBuffer::Descriptor class to Python and adds methods to fetch replica information for specified keys, facilitating more direct interaction with the store's data management from Python applications.

Highlights

• Python Bindings for Replica Descriptors: Introduced Python bindings for AllocatedBuffer::Descriptor, allowing Python clients to interact with memory descriptors directly.
• New get_replica Functionality: Added get_replica and batch_get_replica methods to the Python interface, enabling retrieval of replica descriptors for single or multiple keys from the Mooncake store.
• C++ RealClient Implementation: Implemented the underlying C++ get_replica and batch_get_replica methods in RealClient, which query the store and return lists or maps of Replica::Descriptor objects.

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[stmatengss]

Last thing: make this PR consistent with #1148; it also uses replica desc.

[stmatengss]

Please double-check this PR. CC. @ykwd @YiXR

[ykwd]

LGTM