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DAL: Check the validity of a commitment before validating a message

François Thiré requested to merge francois@dal-check-commitment-correctness-shards into master

What

Add a commitment check for every shard received on the network. This check ensures the commitment is the valid on with respect to what was decided by the consensus on the L1.

Why

Spam protection mechanism.

How

A cache of commitments by slot id is added. This cache is used to know which commitments are valid or not for a given level and slot index.

Manually testing the MR

If the CI passes, it is already good.

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