Split cache interceptor

[KernelPanic92]

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What does this change?

extract auth interceptor from cache interceptor

Why is this change important?

dividing responsabilities into two interceptors respects DRY, improving readability and testability of features.

How can I test it?

cache: when user make a request, it may be executed first time only.

auth: when user is authenticated with GitHub, check auth token in Authorization header.