Converts parser to typescript and fixes context tracker being wack because of incorrect types

Author: alexkar598

dm-lezer/.gitignore

@@ -1,3 +1,3 @@
 node_modules
-src/parser.js
-src/parser.terms.js
+src/parser.ts
+src/parser.terms.ts

dm-lezer/bin/build.ts

@@ -0,0 +1,3 @@
+import { buildDmGrammar } from '../src/build.js';
+
+await buildDmGrammar();