feat(client): allow passing async httpx client#1557

hassiebp wants to merge 2 commits intomainlangfuse/langfuse-python:mainfrom

hassieb/lfe-8749-bug-custom-httpx_client-is-not-applied-to-clientasync_api-inlangfuse/langfuse-python:hassieb/lfe-8749-bug-custom-httpx_client-is-not-applied-to-clientasync_api-inCopy head branch name to clipboard