office-js-preview Page-to-Dialog messaging APIs (#42873)
office-js-preview Page-to-Dialog messaging APIs (#42873)

* office-js-preview page to dialog messaging

* review changes
dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,dsebastien/DefinitelyTyped,mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped