feat: introduce and organize namespace Server
feat: introduce and organize namespace Server

BREAKING CHANGES: Need to prefix `Server.` to plenty of stuff.

magny/DefinitelyTyped,dsebastien/DefinitelyTyped,mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,borisyankov/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,dsebastien/DefinitelyTyped,magny/DefinitelyTyped,borisyankov/DefinitelyTyped