Add siglip2 and parakeet byte-fallback fixtures

Oracle fixtures for huggingface/tokenizers#2673: BPE tokenizers with byte_fallback and missing <0xNN> tokens. siglip2-base-patch16-224 (Gemma vocab, plain tab token instead of <0x09>) and parakeet-tdt-0.6b-v3 (no <0xNN> tokens). Copied unchanged from google/siglip2-base-patch16-224 and nvidia/parakeet-tdt-0.6b-v3.

fixtures/models/parakeet-tdt-0.6b-v3.json

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+size 1159960

fixtures/models/siglip2-base-patch16-224.json

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+version https://git-lfs.github.com/spec/v1
+oid sha256:cb9140fae3ac5122c972d37adf83e1248471a38147ad76f8215c8872c6fd8322
+size 34363039