Function AdPoolProvider

Declarative pool ownership. Creates pools for the configs it is given and destroys them on unmount, reconciling by poolId on every render rather than by array identity.

Renders children unchanged and keeps no React state: it is not a context provider, so it never subscribes to the pool registry. Consumers read pool state through useAdPool / usePooledAd, which subscribe individually; a registry subscription here would re-render the whole subtree every time any pool registered or was destroyed.

The provider owns pools, not ads already handed to consumers:

1. Pass configs with stable poolId values.
2. Descendants use that same id with useAdPool or usePooledAd.
3. Consumers still poll on demand, then render or show the returned ad.

A new pools array with unchanged ids/configs does not recreate native pools; useMemo is an optimization, not a correctness requirement.

Creating a pool initializes the SDK on Android and starts preloading, so pass enabled={consentReady} until consent is resolved. enabled={false} stops future creates only; it never tears down existing pools.