feat(client): add async api client

[hassiebp]

Important

Add asynchronous API client AsyncFernLangfuse to Langfuse class for non-blocking operations.

• Behavior:
  • Add AsyncFernLangfuse to Langfuse class in client.py for asynchronous API operations.
  • Initialize async_public_api_client in Langfuse.__init__() and assign to self.async_api.
• Imports:
  • Import AsyncFernLangfuse from langfuse.api.client.

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Greptile Summary

Disclaimer: Experimental PR review

Added asynchronous API client capabilities to the Langfuse Python SDK while maintaining backward compatibility with the existing synchronous client.

• Added AsyncFernLangfuse client in /langfuse/client.py for non-blocking API calls
• Preserved existing synchronous client as self.api and legacy self.client for backward compatibility
• Added self.async_api property to access new async client functionality
• Maintained consistent timeout and authentication handling between sync/async clients

[greptile-apps]

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[greptile-apps]

logic: The async client is instantiated without an httpx_client, while the sync client uses the shared httpx_client. This could lead to connection pooling issues since the async client will create its own connection pool.