feat: integrate gateway changes for some components

[perekopskiy]

What ❔

Generally moves some code from gateway integration branch into main. High-level list of changes:

• eth_watch: refactors watcher's client so it can use L2-specific features if gateway is queried. New event processor is added for chains that settle on gateway, it calculates part of merkle proof for L2->L1 logs.
• api: new method is added to unstable namespace that is utilized by the new event processor. This method encapsulates a few storage reads + builds merkle tree. This is a temporary measure and method will likely be removed (that's why it's in unstable namespace) pretty soon after a contract getter that does exactly the same is merged into contracts, replacing unstable_getChainLogProof invocation with a simple eth_call
• consistency_checker, tree_data_fetcher: adds support for reading batch commitment from either L1 or GW depending on what the SL is for a batch.
• adds support for new format of commitBatches, proveBatches, executeBatches data encoding
• bug fixes: L2_NATIVE_TOKEN_VAULT_ADDRESS was used instead of L2_ASSET_ROUTER_ADDRESS in core/bin/external_node/src/node_builder.rs, mixed up if/else branches in core/node/commitment_generator/src/lib.rs
• some clean up, renaming, refactoring: resolve_l1_batch_to_l2_block + get_block_details are replaced with just get_batch_details in batch_status_updater, some code for old protocol versions (pre-boojum or pre-shared-bridge) removed, l1_ prefix is added to some addresses to avoid confusion

Why ❔

Finalize and merge some gateway features

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 zkstack dev fmt and zkstack dev lint.