Retrieves the current rate limiter state for a given key.
The unique identifier for the rate limiter.
Returns the rate limiter state if found, otherwise null.
The transaction method runs the fn function inside a transaction.
The fn function is given a IRateLimiterStorageAdapterTransaction object.
IMPORT_PATH:
"@daiso-tech/core/rate-limiter/memory-rate-limiter-storage-adapter"