Delete All Keys

## Description

How can I delete all keys with the correct prefix that was set up in set-up code.
For example:

UseRedis( options => options.DBConfig.KeyPrefix = "dev1"

I want to delete all keys that have the above prefix "dev1" without having to mention the KeyPrefix.

I was very surprised that `IEasyCachingProvider.RemoveAllAsync()` requires keys? What is the use case to use this? Could we have an overload that doesn't take keys as parameters?

I also don't want to use "Flush" method as I believe that will ignore the prefix and require admin config.

The sole reason we are trying this library, as opposed to IDistributedCache, is so we can have a way to clear all cache for the application.

IEasyCachingProvider
## Specifications

- Provider : IEasyCachingProvider
- Serializer : Newtonsoft
- System : Windows 11