Export cache types

[juanpprieto]

Creating custom 3P clients in typescript is hard because we are missing these types. If I attempt to do a custom createCmsClient I am missing the types that I will need to pass to withCache e.g AllCacheOptions...

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• I've read the Contributing Guidelines
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[frandiox]

Considering the following implementation of two of the exposed types:

export type CachingStrategy = AllCacheOptions;

export type NoStoreStrategy = {
  mode: string;
};

Do we really need to make all of these public or can we just use CachingStrategy for everything?
Or maybe even rename it to CacheOptions?