feat(l2): add privileged transaction cap

[iovoid]

Motivation

If the l2 batches include too many privileged transactions, it may happen that the gas cost of getPendingTransactionsVersionedHash(uint16 n) becomes so high it's impossible to commit batches.

Description

To prevent this, we record the privileged transaction count of the batch being built and ensure no more than a fixed amount (300 for now) is added.

We add a spammer (that makes 1800 privileged transactions) as a regression test.

Additionally, this allows enforcing intra-batch ordering of privileged transactions. This prevents the following scenario from happening:

• A sends two deposits with gas values 1 (deposit 1) and 10M (deposit 2)
• B then sends a deposit with gas value 1 (deposit 3)
• The sequencer includes A's first deposit, but not the second because it's too big for the block. Deposit 3 is included because it's small.
• The resulting inclusion order is 1, 3. This out-of-order and therefore the batch is invalid.

[github-actions]

Lines of code report

Total lines added: 144
Total lines removed: 0
Total lines changed: 144

Detailed view

+--------------------------------------------------------------+-------+------+
| File                                                         | Lines | Diff |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/sequencer/block_producer.rs                 | 190   | +5   |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/sequencer/block_producer/payload_builder.rs | 342   | +26  |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/sequencer/l1_committer.rs                   | 540   | +1   |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/storage/src/api.rs                          | 108   | +5   |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/storage/src/store.rs                        | 306   | +9   |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/storage/src/store_db/in_memory.rs           | 290   | +14  |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/storage/src/store_db/libmdbx.rs             | 464   | +34  |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/storage/src/store_db/redb.rs                | 445   | +23  |
+--------------------------------------------------------------+-------+------+
| ethrex/crates/l2/storage/src/store_db/sql.rs                 | 794   | +27  |
+--------------------------------------------------------------+-------+------+