This MR aggregates BLS attestations with DAL content.

Review only the last commit (other commits are cherry-picked from !17640 (merged)).

This MR should be merged along with the protocol changes !17838 (merged).

Manually testing the MR

Tests are in a follow-up MR: !17843.

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

Edited Apr 25, 2025 by Marina Polubelova