Context

See and Closes: #4206 (closed)

Also moves & refactors tests:

tezt/tests/sc_rollup.ml#test_rollup_arith_uses_reveals -> tezt/tests/dal.ml#test_rollup_arith_uses_reveals
tezt/tests/sc_rollup.ml#test_rollup_arith_uses_reveals -> tezt/tests/dal.ml#test_reveals_fails_on_wrong_hash

Manually testing the MR

CI passes

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.
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Edited Nov 22, 2022 by Ryan Tan