Fix issues identified with the Hapi 17 update (#23691)

* Fix issues identified with the Hapi 17 update

This commit introduces a variety of changes, primarily fixes, but it
also collapses the typings into a single file.  Collapsing it into a
single file means simpler augmentation of types, which is common in
Hapi.

Thank you to SimonSchick for contributing a number of changes here.

* fix response property

types/hapi-auth-basic/hapi-auth-basic-tests.ts

@@ -39,5 +39,5 @@ server.register(Basic).then(() => {
     server.auth.strategy('simple', 'basic', { validate });
 	server.auth.default('simple');
 
-    server.route({ method: 'GET', path: '/', config: { auth: 'simple' } });
+    server.route({ method: 'GET', path: '/', options: { auth: 'simple' } });
 });