chore(l1): include Merkle step in metrics logs

[Oppen]

In preparation for performance analysis tooling, we need to include
Merkle-tree specific measures.
Rigorously speaking, this includes most of the data preparation before
committing to the DB. The code assumes Merkle-tree operations to be the
bottleneck there.

The notebook part will be handled in a separate PR based on this branch,
so we can keep the logic in it simpler by only handling one version of
the logs at a time. It also should make it easier to review.

Based on #3274
Coauthored-by: @Arkenan

Part of: #3331

[Copilot]

Pull Request Overview

Adds Merkle-tree timing to block processing logs and exposes the new AccountUpdatesList type for storage operations. Key changes:

• Export AccountUpdatesList in the storage crate.
• Refactored store_block to accept a pre-computed AccountUpdatesList and moved Merkle-tree application outside for timing.
• Enhanced print_add_block_logs to include a Merkle step and percentage breakdown in the metrics log.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
crates/storage/lib.rs	Added AccountUpdatesList to the public exports.
crates/blockchain/blockchain.rs	Propagates AccountUpdatesList, captures Merkle timing, and updates log formatting with percentage breakdown.

Comments suppressed due to low confidence (2)

crates/blockchain/blockchain.rs:423

• The log string prints Gas Used: {:.3} ({:.0}%) without a unit on the first value. It would be clearer to include the unit (e.g., Ggas) next to that number.

                "[METRIC] BLOCK EXECUTION THROUGHPUT ({}): {:.3} Ggas/s TIME SPENT: {:.0} ms. Gas Used: {:.3} ({:.0}%), #Txs: {}.",

crates/blockchain/blockchain.rs:403

• The new print_add_block_logs method and its formatting logic aren't covered by unit tests. Consider adding tests to verify the output string and percentage calculations.

    fn print_add_block_logs(

[Copilot]

[nitpick] This nested percentage function returns an f64 and lives inside the logging method. Consider returning an integer type (e.g., u64) for rounded percentages and moving it out to improve readability.

[github-actions]

Lines of code report

Total lines added: 13
Total lines removed: 0
Total lines changed: 13

Detailed view

+----------------------------------------------+-------+------+
| File                                         | Lines | Diff |
+----------------------------------------------+-------+------+
| ethrex/crates/blockchain/blockchain.rs       | 769   | +6   |
+----------------------------------------------+-------+------+
| ethrex/crates/l2/sequencer/block_producer.rs | 195   | +6   |
+----------------------------------------------+-------+------+
| ethrex/crates/storage/lib.rs                 | 12    | +1   |
+----------------------------------------------+-------+------+