Grammar: Initial Formatron regex and JSON schema implementation

* Replace LMFE's regex and JSON schema filters with Formatron's
* Remove Outlines EBNF filter in preparation for Formatron KBNF filter
* TODO: Implement Formatron KBNF filter

pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
     "sse-starlette",
     "packaging",
     "tokenizers",
-    "lm-format-enforcer >= 0.9.6",
+    "formatron",
     "aiofiles",
     "aiohttp",
     "async_lru",
@@ -53,7 +53,6 @@ dependencies = [
 [project.optional-dependencies]
 extras = [
     # Heavy dependencies that aren't for everyday use
-    "outlines",
     "infinity-emb",
     "sentence-transformers",
 ]