This MR aims to bring parallel computation when it comes to validate batches of shards. This is done using the Task_worker from lib_bees.

Manually testing the MR

Green CI. One should also notice better performances when it comes to validate batches

TEZOS_LOG="dal.batch_validation_stats -> info" ./octez-dal-node run --endpoint ``https://rpc.tzkt.io/seoulnet`` --operator-profile=0

On seoulnet it is likely not to be perceptible.

Benchmarks to come

Checklist

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
Select as Assignee the next person who should take action on that MR