fix(anthropic): ensure read/write cache tokens are recorded with streaming methods

[guillaumefrd]

This PR is to patch the read/write cache tokens that were missing from the trace when using anthropic streaming (with client.messages.create(..., stream=True) or client.messages.stream(...))

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[guillaumefrd]

I have read the CLA Document and I hereby sign the CLA

[axiomofjoy]

Thanks @guillaumefrd, can you add a unit test to verify that the cache tokens are successfully recorded?

[nate-mar]

Hi @guillaumefrd ! let us know if you need any assistance here; happy to take it across the line if you don't have bandwidth. Thanks again for the contribution; we really appreciate it!