twa manifest enhancement - launch_handler

**Is your feature request related to a problem? Please describe.**
Request for addition of support for "launch_handler" in twa manifest json to bring it in parity with PWA.

The launch_handler feature in TWA will help control the number of instances of TWA application that gets opened in a given session.

Problem: Currently, a new TWA application instance gets opened everytime a handler URL is clicked on browser.
Expectation: is to have a single instance of TWA application that handles multiple URL navigations.
OS: ChromeOS

**Describe the solution you'd like**
The support is already live for >= chrome 110 PWA. https://developer.chrome.com/docs/web-platform/launch-handler/
We can probably add same/similar key name for twa manifest json and give the same capability as that of PWA.