Feat(medusa): First interceptor pattern proposal

[adrien2p]

What

In some cases, it make sense to be able to manipulate or do some action before reaching an end point, and it goes the same to intercept a response and manipulate or do some actions before being sent to the client. It can be simple or complex cases and it can be a good thing to be able to separate that logic from the handler to keep the responsibility clean but close together.

How

A new function useInterceptors is proposed, as well as an abstract Interceptor that can be extender to build an interceptor, it will manage the interception of both input/output and take an array of interceptors as a parameter and will manage to call the before and after of each of them.

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