OCaml: Add a configuration lexer

ocaml/lib/utilities/text.ml

@@ -0,0 +1,8 @@
+let chars_of_string (string: string): char list =
+    let rec split string index chars =
+        if index = String.length string then chars
+        else split string (index + 1) (string.[index] :: chars)
+    in List.rev (split string 0 [])
+
+let string_of_chars (chars: char list): string =
+    String.concat "" (List.map (String.make 1) chars)