TypeScript: add the "awaited" type operator
Summary: Add the new keyword "awaited": https://github.com/microsoft/TypeScript/pull/35998
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/D28814