Add new shortcut utilities for collecting StateFlows in a safe manner.
The priamry addition here is collectImmediately. collectImmediately
just calls block with the existing value initially, which helps remove
a good amount of bugs regarding state initialization. Sure, it is a bit
inefficient given that it will also initialize on startup, but this is
okay.
The other utilities are the same, but simply remove the launch
boilerplate.
