Add tiny Fuyu tokenizer fixture for testing

tokenizer.json

@@ -13,7 +13,7 @@
       "special": true
     },
     {
-      "id": 502,
+      "id": 503,
       "content": "|ENDOFTEXT|",
       "single_word": false,
       "lstrip": false,
@@ -85,7 +85,7 @@
       "|ENDOFTEXT|": {
         "id": "|ENDOFTEXT|",
         "ids": [
-          502
+          503
         ],
         "tokens": [
           "|ENDOFTEXT|"
@@ -2129,6 +2129,10 @@
         "|NEWLINE|",
         0.0
       ],
+      [
+        "▁",
+        -1.457676649093628
+      ],
       [
         "|ENDOFTEXT|",
         0.0