feat: gte-multilingual-base as option

[zanussbaum]

Important

Add gte-multilingual-base as an embedding model option and provide a multilingual mapping example.

• Behavior:
  • Adds gte-multilingual-base as an embedding model option in NomicEmbedOptions in data_inference.py.
  • New example script map_multilingual.py demonstrates using gte-multilingual-base for mapping English-German translations.
• Misc:
  • No changes to existing functionality or other parts of the codebase.

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