fix(ai): add message trunction to anthropic

[shellmayr]

• Add gen_ai.request.message truncation to anthropic as introduced in fix(ai): introduce message truncation for openai #4946

Contributes to TET-1208

[linear]

TET-1208 Python SDK: truncate gen_ai messages

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
23934	1	23933	1719

View the top 1 failed test(s) by shortest run time

tests.integrations.django.asgi.test_asgi::test_basic[application0]

Stack Traces | 1.25s run time

.tox/py3.11-django-v4.2.25/lib/python3.11........./site-packages/asgiref/testing.py:110: in receive_output
    return await self.output_queue.get()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.../hostedtoolcache/Python/3.11.13.../x64/lib/python3.11/asyncio/queues.py:158: in get
    await getter
E   asyncio.exceptions.CancelledError

During handling of the above exception, another exception occurred:
.../django/asgi/test_asgi.py:61: in test_basic
    response = await comm.get_response()
               ^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/py3.11-django-v4.2.25/lib/python3.11.../channels/testing/http.py:42: in get_response
    response_start = await self.receive_output(timeout)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/py3.11-django-v4.2.25/lib/python3.11.../channels/testing/application.py:17: in receive_output
    return await super().receive_output(timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/py3.11-django-v4.2.25/lib/python3.11........./site-packages/asgiref/testing.py:121: in receive_output
    raise e
.tox/py3.11-django-v4.2.25/lib/python3.11........./site-packages/asgiref/testing.py:109: in receive_output
    async with async_timeout(timeout):
.tox/py3.11-django-v4.2.25/lib/python3.11....../site-packages/asgiref/timeout.py:71: in __aexit__
    self._do_exit(exc_type)
.tox/py3.11-django-v4.2.25/lib/python3.11....../site-packages/asgiref/timeout.py:108: in _do_exit
    raise asyncio.TimeoutError
E   TimeoutError

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