feat(asyncio): add Reader API

[BewareMyPower]

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[Copilot]

Pull request overview

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Adds an asyncio-compatible Reader API to the Python Pulsar client, including C++ binding support and new integration tests.

Changes:

• Introduced pulsar.asyncio.Reader with async read_next, seek, has_message_available, and close.
• Added pybind11 C++ exports for Reader async methods and Client async reader creation.
• Added asyncio test coverage for basic reader flows (start positions, seek, message availability, auth failure).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
tests/asyncio_test.py	Adds asyncio integration tests validating new Reader behaviors (read, seek, has-message, auth).
src/reader.cc	Exposes Reader async operations (read_next_async, seek_async, etc.) via pybind11 with GIL release.
src/client.cc	Exposes async reader creation APIs (create_reader_async, create_reader_async_v2) for asyncio wrapper use.
pulsar/asyncio.py	Implements the new Reader wrapper and Client.create_reader() coroutine.

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