Function createLazyBackend

Lazily resolve an idempotency backend on first use.

Use this when the real backend depends on application infrastructure that is resolved asynchronously after SDK server construction, for example:

const store = createIdempotencyStore({
  backend: createLazyBackend(async () => redisBackend(await getRedisClient(), { keyPrefix })),
});
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Concurrent first calls share a single factory invocation. If the factory fails, the wrapper forgets that failed attempt so a later call can retry.

clearAll() is not exposed by default because its presence is used by compliance reset code as the backend's explicit "safe to flush" signal. Set { clearAll: true } only when every backend the factory can return supports and safely permits bulk clearing.