[Improve][Transform-V2][Embedding]Enhance multimodal embeddings

[loupipalien]

Purpose of this pull request

Multi-field multimodal vectorization, doubao-embedding-vision supports multi-field multimodal mixing as input

vectorization_fields {
      multi_field_text_vector = [product_name, description]

      multi_field_image_vector = [
        {
          field = product_image_url
          modality = jpeg
          format = url
        },
        {
          field = thumbnail_image
          modality = png
          format = url
        }
      ]

      multi_field_video_vector = [
        {
          field = product_video_url
          modality = mp4
          format = url
        },
        {
          field = promotional_video
          modality = mov
          format = url
        }
      ]

      multi_field_mix_vector = [
        product_name,
        {
          field = product_image_url
          modality = jpeg
          format = url
        },
        {
          field = product_video_url
          modality = mp4
          format = url
        }
      ]
 }

Does this PR introduce any user-facing change?

Yes

How was this patch tested?

Add new test cases

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config

[loupipalien]

@Hisoka-X @corgy-w @xiaochen-zhou help to review if have time, thanks