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The OpenAIMessageConverter does not currently handle VideoBlock content when converting messages for…

The OpenAIMessageConverter does not currently handle VideoBlock content when converting messages for…: a task in LegoFlow-SWE (Harbor dataset). The OpenAIContentPart class should be extended to support a "video url" type, analogous to the existing "image url" support. It should expose a videoUrl…

The task

The `OpenAIContentPart` class should be extended to support a `"video_url"` type, analogous to the existing `"image_url"` support. It should expose a `videoUrl` property that can be set via a builder method (for example, `OpenAIContentPart.videoUrl(...)`) and retrieved later via `getVideoUrl()`.

Part of Lego-X/LegoFlow-SWE.