🔥 feat(web): Offline behavior

[Charles Hudson (phobetron)]

The following has been done to improve offline behavior:

• Addition of an online state in CoreStateful, defaults to true
• Addition of listener logic to flip the online state in Web
• Addition of an "offline queue" for PersonalizationStateful in Core
  • If online, event triggering methods request and return profile data immediately
  • If offline, event triggering methods queue event data and return undefined
  • The offline queue flushes as soon as online becomes true to ensure immediate updates

Some minor changes to the default state value configuration structure have also been included, so that will make more sense... I must have been stuck in a wrong-thinking decoupling pattern when I created the previous structure.

[NT-2124]