Add a PHP interface to work with the language data

Additional changes in this PR include,

  * Added composer.json
  * Refactored the folder structure.
  * Added editorconfig.
  * Added PHPCS and formatted existing code.
  * Changes to use a single license - GPL-2.0-or-later
  * ESLint related fixes

Bug: T218639

.gitignore

@@ -14,3 +14,5 @@ yarn-error.log*
 *.njsproj
 *.sln
 
+# PHP
+vendor/