feat(Validium): refactor batch commit data generation

[Oppen]

What ❔

Reworks L1BatchCommitDataGenerator, CommitBatches and CommitBatchInfo.
This PR moves most of the encoding responsibility to per-operation-mode
structures derived from CommitBatches and CommitBatchInfo, modifying
their Tokenize implementations. In turn, the L1BatchCommitDataGenerator
implementations now differ only on which variant they instantiate to
delegate the request for tokenization.
After that, all aggregation logic and data generators is moved to eth_sender.

The goal is to apply these recommendations.

NOTE: the following tests are failing both here and in the base branch:

     Summary [ 230.521s] 853 tests run: 850 passed, 3 failed, 2 skipped
        FAIL [   1.969s] zksync_core eth_sender::tests::correct_order_for_confirmations
        FAIL [   1.883s] zksync_core eth_sender::tests::skipped_l1_batch_at_the_start
        FAIL [   1.848s] zksync_core eth_sender::tests::skipped_l1_batch_in_the_middle

Why ❔

The original changes for the L1 publish behaviour were a bit disperse over the
codebase, leading to hard to understand code and a more complex dependency graph.

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via zk fmt and zk lint.
• Spellcheck has been run via zk spellcheck.
• Linkcheck has been run via zk linkcheck.

[popzxc]

Nice progress here!