Etherlink/Node: add DAL config to sequencer config

What

This MR extends the sequencer configuration of the EVM node with the DAL feature flag and the list of DAL slot indices on which the sequencer is allowed to publish DAL slots.

Stacked on !13678 (merged).

Why

The sequencer will need to know this to actually publish on the DAL in a future MR (!13883 (merged)). Alternatively, it could probably read it from the permanent storage of the rollup but putting it in the config was simpler.

How

Manually testing the MR

Run any sequencer test with the dal Tezt feature and keep the logs:

dune exec tezt/tests/main.exe -- --file etherlink/tezt/tests/evm_sequencer.ml dal --only 1 --log-file log

Observe in test log that the sequencer is correctly configured

grep 'octez-evm-node init config' log | grep -c -- '--dal-slots 4'

This should return 1.

Same with a non-dal test:

dune exec tezt/tests/main.exe -- --file etherlink/tezt/tests/evm_sequencer.ml /dal --only 1 --log-file log

grep 'octez-evm-node init config' log | grep -c -- '--dal-slots'

This should now return 0 meaning that the sequencer was configured with DAL disabled.

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