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

---------

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

conversion/__init__.py

@@ -215,6 +215,7 @@ TEXT_MODEL_MAP: dict[str, str] = {
     "Starcoder2ForCausalLM": "starcoder",
     "Step3p5ForCausalLM": "step3",
     "StepVLForConditionalGeneration": "step3",
+    "Step3p7ForConditionalGeneration": "step3",
     "T5EncoderModel": "t5",
     "T5ForConditionalGeneration": "t5",
     "T5WithLMHeadModel": "t5",
@@ -283,6 +284,7 @@ MMPROJ_MODEL_MAP: dict[str, str] = {
     "Sarashina2VisionForCausalLM": "sarashina2",
     "SmolVLMForConditionalGeneration": "smolvlm",
     "StepVLForConditionalGeneration": "step3",
+    "Step3p7ForConditionalGeneration": "step3",
     "UltravoxModel": "ultravox",
     "VoxtralForConditionalGeneration": "ultravox",
     "YoutuVLForConditionalGeneration": "youtuvl",