Encapsulate Application related services inside application

[rymsha]

Currently Application is a separate entity which uses Bundle, which causes a few issues
Locales, Resources and Nashorn engines, Tasks etc... live its own life and require special care when application started/updated/stopped.
Partially it is done with ApplicationInvalidator listeners, but they are asynchronous and concurrent.
Partially it is done via ConcurrentHashMap.compute* but it is deadlock prone.
Both ApplicationInvalidator and ConcurrentHashMap use application name as a key.
Most issues arise when application gets updated because two equally named bundles "coexist" in in-flight events. One tries to stop and cleanup, another tries to start and boostrap.

If application encapsulates all its services than we don't need the invalidation logic. Locale cache, Resources, Nashorn Engine and task executors will be garbage collected together with Application instance.

[rymsha]

Issues like #7994 #7925 #6608 #6667 #7821 #7842 wont even appear (probably)