feat: add new OpenAI model: gpt-4o

[jemc]

This model was just released this week, and is said to be cheaper and faster, while still performing well.

The docs say it can do function calling, so it is being added here as supported by Kurt.

[github-actions[bot]]

:tada: This PR is included in version @formula-monks/kurt-open-ai-v1.2.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: