perf(l1, l2): move post-execution trie updates to the background

[edg-l]

Motivation

This PR moves the trie portion of the apply_updates function to a background thread, improving block execution times. This background thread receives messages through a channel to apply new trie updates and does two things:

• First, it updates the in-memory diff layers and notifies the process that sent the message (i.e. the block production thread) so it can continue with block execution.
• Second, it performs the logic of persisting the bottom-most diff layer to disk. To do this, we first pause the ongoing thread in charge of generating the snapshots (i.e. FlatKeyValue) through a message, then persist the diff layer to disk, then notify again the thread to continue snapshot generation.

Description

Closes #issue_number

[github-actions]

Lines of code report

Total lines added: 91
Total lines removed: 27
Total lines changed: 118

Detailed view

+---------------------------------------------+-------+------+
| File                                        | Lines | Diff |
+---------------------------------------------+-------+------+
| ethrex/crates/networking/p2p/snap.rs        | 931   | +1   |
+---------------------------------------------+-------+------+
| ethrex/crates/storage/store_db/in_memory.rs | 630   | -2   |
+---------------------------------------------+-------+------+
| ethrex/crates/storage/store_db/rocksdb.rs   | 1544  | +90  |
+---------------------------------------------+-------+------+
| ethrex/crates/storage/trie_db/layering.rs   | 114   | -25  |
+---------------------------------------------+-------+------+

[ilitteri]

We need to test these changes in the L2

[edg-l]

Fixed conflicts and review comments

This is already being tested in the L2