Add histories cache in dal_slot_repr for attested slots

Context

This MR adds a module Cache in Dal_slot_repr, which is basically an instantiotion of Bounded_history_repr.Make functor. It will be used by the SCORU rollup node to remember the latest values of the skip list Slots_history.t (which evolves when adding new attested DAL slots to it). The cache is needed to produce refutation proofs involving DAL inputs (Similarly to the History module of sc_rollup_inbox_repr).

Manually testing the MR

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
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• Provide automatic testing (see the testing guide).
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