fix: memory leaks

[arthurgeron]

Closes #1416

• All Service Worker services now have a destroy or close method;
• Ensure all Services' listeners, connections and connections are properly removed on destroy;
• Removed all logic that forced the Service Worker to stay awake;
• Ping JSONRPC event no longer triggers Keep Awake logic;
• Allow service worker to be paused and resumed;
• Ensure the Service Worker is properly restarted on update;
• PopupServer instances will automatically self-destroy after being used, as they can be re-created when needed;
• Avoid permanent interval by only starting auto-lock timer when wallet is unlocked;
• Avoid permanent Content Script interval/looped calls by opening connection, if closed, when needed;
• Previously if any of the services threw an exception the service worker would stop working, now it restarts and resumes execution
• Updated Dexie to 3.2.7, which brings fixes around a DB corruption bug
• Updated Fuel SDK to 0.94.5
• Fixed error in parsing headers, in Provider's middleware, when the selected network goes offline.