Add syntax highlighting for TypeScript & TypeScript React

Summary:
TypeScript is a superset of JavaScript, therefore, it use JavaScript highlighting, adding some features and built-in classes and functions. It is based on the official TextMate grammar files: https://github.com/Microsoft/TypeScript-TmLanguage

The TypeScript React highlighting adds support for tags, such as XML.

Also, some modifications are made to the JavaScript & JavaScript React:

JavaScript:

• The shebang is corrected, empty lines are no longer allowed before the shebang.
• Add missing keywords.
• Add rule to highlight "default" in switch conditions.
• Add operator: "=>".
• The "FindComments" & "FindStrings" contexts are created, which is used by typescript.xml.

JavaScript React:

• Fix shebang.
• Fix: add Doxygen comments.
• Other minor changes.

Depends on D17085

FEATURE: 384716

Reviewers: Framework: Syntax Highlighting, dhaumann, cullmann

Reviewed By: Framework: Syntax Highlighting, cullmann

Subscribers: kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D17092