tests : use new tokenizer type API (#2692)

* Merge tokenizer fixes into the gguf branch.

* Add test vocabularies

* Adapt convert-new.py (and fix a clang-cl compiler error on windows)

* Improved tokenizer test

But does it work on MacOS?

* Improve token type support

- Added @klosax code to convert.py
- Improved token type support in vocabulary

* Exclude platform dependent tests

* More sentencepiece compatibility by eliminating magic numbers

* Restored accidentally removed comment

* Improve commentary

* Use token type API in test-tokenizer-1.cpp

convert.py

@@ -741,6 +741,8 @@ class OutputFile:
         tokens = []
         scores = []
         toktypes = []
+        # NOTE: `all_tokens` returns the the base vocabulary and added tokens
+        # TODO: add special tokens?
         for text, score, toktype in vocab.all_tokens():
             tokens.append(text)
             scores.append(score)
@@ -751,8 +753,6 @@ class OutputFile:
         self.gguf.add_token_scores(scores)
         self.gguf.add_token_types(toktypes)
 
-        # TODO: added / special tokens
-
     def add_tensor_info(self, name: str, tensor: LazyTensor) -> None:
         n_elements = 1
         for dim in tensor.shape: