convert : support Step3.7-Flash (#23845)
* feat: support step3.7
* fix: register Step-3.7 BPE pre-tokenizer hash
* delete fromjson
* register step3.7 arch to Step35Model
* drop vit projector in base filter
* Apply suggestion from @CISC
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
* restore blank line
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
