feat(llmobs): capture inline base64 images for OpenAI chat completions and responses - #19690

• All applicable files are owned properly
  _{Digest: 40fbf1f}

• All applicable commits are signed and verified
  _{Digest: 6a58997}

• All required reviewers must approve this pull request before it can be merged. Learn more in our FAQ.

• Needs approval from Team: apm-python

• Needs approval from Team: ml-observability

  _{Questions about this check? Reach out in #dx-source-code-management on Slack.
  Digest: 9363125}

if this seems incorrect, you can retrigger the evaluation of the MergeGate by clicking on this link