Modified index build data types and expected values to match API contract

[rchitale7]

Description

• Removed float16, byte, and binary from supported vector data types
• Removed cosine, l1, linf, and hamming from supported space types
• Modified API contract to return file_path instead of index_path
• Updated upload_index task to always upload a knn index with the same path as the vector_path, except with a different file extension, based on the engine.
  • This change was technically not necessary, but I felt that it makes the knn index path more predictable

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