feat(litellm): Add async callbacks

[alexander-alderman-webb]

Description

Issues

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• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
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Codecov Results 📊

✅ 48 passed | Total: 48 | Pass Rate: 100% | Execution Time: 10.52s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	📈 +2
Failed Tests	—
Skipped Tests	📉 -2

✨ No test changes detected

All tests are passing successfully.

❌ Patch coverage is 0.00%. Project has 15729 uncovered lines.
❌ Project coverage is 25.91%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
litellm.py	0.00%	⚠️ 148 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    25.97%    25.91%    -0.06%
==========================================
  Files          191       191         —
  Lines        21221     21231       +10
  Branches      6976      6982        +6
==========================================
+ Hits          5511      5502        -9
- Misses       15710     15729       +19
- Partials       524       521        -3

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Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

Litellm

• Add async callbacks by alexander-alderman-webb in #5969

• Add async callbacks by alexander-alderman-webb in #5969

Other

• (ai) Redact base64 data URLs in image_url content blocks by ericapisani in #5953
• (integrations) Instrument pyreqwest tracing by servusdei2018 in #5682

Bug Fixes 🐛

Anthropic

• Capture exceptions for stream() calls by alexander-alderman-webb in #5950
• Stop setting transaction status when child span fails by alexander-alderman-webb in #5717
• Only finish relevant spans in .create() patches by alexander-alderman-webb in #5716

Other

• (litellm) Avoid double span exits when streaming by alexander-alderman-webb in #5933
• (pydantic-ai) Use first-class hooks when available by alexander-alderman-webb in #5947
• (wsgi) Respect HTTP_X_FORWARDED_PROTO in request.url construction by sl0thentr0py in #5963

Internal Changes 🔧

• (ai) Remove gen_ai.tool.type span attribute by ericapisani in #5964
• (anthropic) Separate sync and async .create() patches by alexander-alderman-webb in #5715
• (litellm) Replace mocks with httpx types in nonstreaming completion() tests by alexander-alderman-webb in #5937
• (openai) Split token counting by API for easier deprecation by ericapisani in #5930
• (opentelemetry) Ignore mypy error by alexander-alderman-webb in #5927
• Fix license metadata in setup.py by sl0thentr0py in #5934
• Update validate-pr workflow by stephanie-anderson in #5931

Other

• Handle None span context in the span processor and pin tokenizers version for anthropic tests on Python 3.8 by alexander-alderman-webb in #5967

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