hls.js handles multiple keys by creating a new key-session per key-id. Let's see if we can reduce license requests when a session provides multiple key-statuses.

Uncovered while working on #7414:

Commented on flaws in MediaKeySessionContext that limit handling of key sessions to a single key ID. Grouping of sessions by KEY URI and handling multiple keys (level key objects and key statuses) will be addressed in a future release.

hls.js/src/controller/eme-controller.ts

Lines 55 to 60 in 7a089f0

	export interface MediaKeySessionContext {
	keySystem: KeySystems;
	mediaKeys: MediaKeys;
	decryptdata: LevelKey; // FIXME: LevelKey has a URI which should be bound to the session, but is dependent one KeyId specifically. Session context should be allowed to adopt multiple level keys.
	mediaKeysSession: MediaKeySession;
	keyStatus: MediaKeyStatus; // FIXME: MediaKeySession can manage multiple keys with each with its own status

Originally posted by @robwalch in #7414 (comment)