Rename FragmentFlowStore to FragmentStore and update related classes.

[Laimiux]

What

A bunch of renames to keep things consistent.

[carrotkite]

	1 Warning
⚠️	No coverage data found for com/instacart/formula/android/FeatureFactory

JaCoCo Code Coverage 89.67% ✅

Class	Covered	Meta	Status
com/instacart/formula/android/ActivityStoreContext	100%	0%	✅
com/instacart/formula/android/Feature	100%	0%	✅
com/instacart/formula/android/FeatureFactory	No coverage data found : -%	No coverage data found : -%	🃏
com/instacart/formula/android/ActivityStore	100%	0%	✅
com/instacart/formula/android/FragmentState	0%	0%	✅
com/instacart/formula/android/FragmentOutput	100%	0%	✅
com/instacart/formula/android/internal/ActivityManager	64%	0%	✅
com/instacart/formula/android/internal/FormulaFragmentViewFactory	50%	0%	✅
com/instacart/formula/android/internal/FragmentFlowRenderView	68%	0%	✅
com/instacart/formula/android/internal/ActivityStoreContextImpl	66%	0%	✅

Generated by 🚫 Danger