How to get the list of Keys in cache

[maivizhi_arunag]

I have implemented response cache in my usecase to cache the backend response. I dint specify the CacheResource explicitly hence shared cache is being used to store the data.

1. Is there a way to get the list of Cache Keys that are available in shared cache for my organization?
2. Also, how do I get the list of Cache Keys in user defined cache?