[FEATURE] Update upcoming screen

[rosenpin]

The upcoming screen should be the main screen if the user already has goals
We should also clean it up a bit:

• [x] make loading animation smoother and don't show the schedule until we load it
• [x] cache completed past events so we don't have to load them while scrolling
• [x] make loading animation on scroll smoother and more flushed out
• [x] add button to open google calendar/device calendar directly from that screen
• [x] consider adding monthly view
• [x] long press event to open it in the goals screen