feat(integrations): aws boto3 sdk

[Mahhheshh (Mahhheshh)]

An attempt to enable tracing for aws boto3 sdk. #279

This PR Adds:

• Braintrust tracing support for Converse API
• vcr backed tests for the Converse
• auto instrument test

AI closure: (parts written by AI, I gave up)
Source Code

• _MIME_TYPES
• _normalize_converse_message_content
• _normalize_converse_message_content

Tests

• test_normalize_converse_message_content_converts_inline_media_bytes
• test_normalize_converse_message_content_preserves_non_binary_sources_and_errors

Example Trace (as basic as it could get only text baby)

{
  "id": "4863118b-12f0-49c6-8eb3-e3503ee44f78",
  "metrics": {
    "start": 1781631248.7061074,
    "end": 1781631248.710462,
    "duration": 0.004354715347290039,
    "prompt_tokens": 18.0,
    "completion_tokens": 5.0,
    "tokens": 23.0
  },
  "span_attributes": {
    "type": "SpanTypeAttribute.LLM",
    "name": "bedrock_runtime.converse",
    "exec_counter": 1
  },
  "context": {
    "caller_functionname": "pytest_pyfunc_call",
    "caller_filename": "/home/mahi/OpenSource/braintrust-sdk-python/py/.nox/test_boto3-latest/lib/python3.14/site-packages/_pytest/python.py",
    "caller_lineno": 167
  },
  "input": {
    "messages": [
      {
        "role": "user",
        "content": [
          {
            "text": "what's 2+2"
          }
        ]
      }
    ]
  },
  "metadata": {
    "runtime_provider": "aws_bedrock_runtime",
    "model": "claude-3-haiku-20240307-v1",
    "model_provider": "anthropic",
    "instructions": "answer only in single integer"
  },
  "project_id": "test-boto3",
  "log_id": "g",
  "output": {
    "message": {
      "role": "assistant",
      "content": [
        {
          "text": "4"
        }
      ]
    }
  },
  "created": "2026-06-16T17:34:08.705904+00:00",
  "span_id": "48080a1c-7d82-42a5-b122-850565b8e97b",
  "root_span_id": "48080a1c-7d82-42a5-b122-850565b8e97b",
  "span_parents": null
}

Future;
...

Meme to make day better

[Mahhheshh (Mahhheshh)]

could have followed the similar approach to Anthropics patching, I found this simple, convenient, it's ugly but this works.

[Mahhheshh (Mahhheshh)]

closing in favor of 519