include server_tool_use in streaming usage

[KeremTurgutlu]

Title

Currently anthropic server_tool_use is not included in usage metadata when stream=True and as a result not available in the response_obj.usage used by a custom logger. This PR adds server_tool_use to streaming usage.

Relevant issues

Fixes: #16631

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix

Changes

Notes

Linting

Linting runs fine locally but for some reason failing in Github actions.

Tests

Only 2 tests are failing and both appear to be related to missing dependencies, I've run test-unit which I was expecting to build the required environment using potery:

================================================================================================================================= short test summary info ==================================================================================================================================
FAILED tests/test_litellm/llms/vertex_ai/vertex_gemma_models/test_vertex_gemma_transformation.py::TestVertexGemmaCompletion::test_acompletion_basic_request - litellm.exceptions.BadRequestError: litellm.BadRequestError: Vertex_aiException BadRequestError - vertexai import failed please run `pip install -U "google-cloud-aiplatform>=1.38"`. Got error: No module named 'vertexai'
FAILED tests/test_litellm/llms/gemini/test_gemini_common_utils.py::TestGoogleAIStudioTokenCounter::test_clean_contents_for_gemini_api_preserves_other_fields - ModuleNotFoundError: No module named 'google.genai'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 2 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! xdist.dsession.Interrupted: stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
============================================================================================================ 2 failed, 892 passed, 11 skipped, 16 warnings in 205.77s (0:03:25) ============================================================================================================
make: *** [test-unit] Error 2

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