Here's the full Oracle MySQL grammar (#4103)

* Replace the simple readme for Oracle's MySQL grammars with the full grammar

This patch comes not only with the grammars, but also with a TypeScript implementation of 2 support classes and a demo.

* Also added the new grammar to the top level json.

* Simplified copyrights

* Generated files are now kept in the main folder

This avoids imports with paths.

* Trying to fix the tests by using a different folder name

* Fixed wrong folder name

* Going back to the original structure

Setting up testing for the grammars requires too much effort. That's why I removed the TypeScript (antlr4ng) target from desc.xml in the hope this would prevent a test run.

* Removed a class member not related to this grammar

.gitignore

@@ -29,3 +29,5 @@ out
 # Ignore downloaded temporaries create by _scripts/get-antlr.ps1
 antlr4-*-complete.jar
 
+node_modules
+package-lock.json

grammars.json

@@ -5366,6 +5366,17 @@
    "/smoke_tests.sql"
   ]
  },
+ {
+  "name": "MySQL",
+  "lexer": "https://raw.githubusercontent.com/antlr/grammars-v4/master/sql\\mysql\\Oracle/MySQLLexer.g4",
+  "parser": "https://raw.githubusercontent.com/antlr/grammars-v4/master/sql\\mysql\\Oracle/MySQLParser.g4",
+  "start": "root",
+  "example": [
+   "/bitrix_queries_cut.sql",
+   "/sakila-data.sql",
+   "/statements.sql",
+  ]
+ },
  {
   "name": "Phoenix",
   "lexer": "https://raw.githubusercontent.com/antlr/grammars-v4/master/sql\\phoenix/PhoenixLexer.g4",