Offer alternative to memcache outside docker

[Xuzzo]

Our data shapley methods heavily rely on memcache. On windows, the best (only?) way to use memcache is through Docker, which is a problem cause Docker is not free of charge.
In the spirit of making our repository plug and play and as independent as possible, we should offer an alternative to memcache within our utility wrapper.

[AnesBenmerzoug]

We should probably have a Cache abstraction with multiple implementations to give ourselves and the users more flexibility and to hide away implementation details.

The most commonly used caches are, excluding Memcached, Redis for distributed settings and SQlite for in-memory or on-disk caching.

[mdbenito]

Disabling memcache by default would be a stopgap, see #210 => moving this to a later milestone