Create a sectioned IAppCache

[kkd83]

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Is your feature request related to a problem? Please describe.
Dependency injected I have an IAppCache which I can add items to but I have to build the key so there is no possible clash with another. This is usually fine but would be better if I could define a section dedicated to my types without worry of a clash.

Describe the solution you'd like
I'm proposing adding an extension IAppCache GetSection(this IAppCache cache, string section) which would prepend the section to every key automatically.

This would be a very small non-breaking change.

Describe alternatives you've considered
None that I can think of.

Additional context
None.