Add TrySet method for providers

[catcherwong]

Description

We need TrySet/TrySetAsync methods for providers.

If we want to add a cache with an existed key, we should not handle it and return false.

If the cache is not an existed key, we should add it to the cached value and return true.

Steps to Reproduce

None

Related code

bool TrySet<T>(string cacheKey, T cacheValue, TimeSpan expiration);

Task<bool> TrySetAsync<T>(string cacheKey, T cacheValue, TimeSpan expiration);

Specifications

None

[catcherwong]

Version 0.4.2 contains this caching API.