Need a reliable way to find cards that can be played from not own hand zone

Fixing #9521 should enable something along the lines of

```
game.getContinuousEffects().getApplicableAsThoughEffects(AsThoughEffectType.PLAY_FROM_NOT_OWN_HAND_ZONE, game)
```

to be used for finding all cards that can be played in a way that other effects can reference. This is important for cost reduction effects that have to apply to spells before they are put on the stack; for example `GainAbilityControlledSpellsEffect` and [[Henzie]]. Right now they have to blindly apply to all objects in other zones in order to apply to playable objects, which causes and/or masks other problems with the implementation.