feat(api): Remove unused and obsolete token info (matter-labs#1071)

## What ❔

- Soft-removes fields from the tokens table that are currently not used
or are used only by the `zks_getTokenPrice` method: `usd_price`,
`usd_price_updated_at`, `market_volume`, `market_volume_updated_at`,
`token_list_name`, `token_list_symbol`, `token_list_decimals`.
- Removes `zks_getTokenPrice` method (deprecated for some time; returns
incorrect or severely outdated data).

## Why ❔

- Codebase maintenance.
- Part of preparations to support tokens on EN after snapshot recovery.

## Checklist

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

core/bin/snapshots_creator/src/tests.rs

@@ -157,7 +157,8 @@ async fn create_miniblock(
         .unwrap();
     conn.storage_logs_dal()
         .insert_storage_logs(miniblock_number, &[(H256::zero(), block_logs)])
-        .await;
+        .await
+        .unwrap();
 }
 
 async fn create_l1_batch(
@@ -179,7 +180,8 @@ async fn create_l1_batch(
     written_keys.sort_unstable();
     conn.storage_logs_dedup_dal()
         .insert_initial_writes(l1_batch_number, &written_keys)
-        .await;
+        .await
+        .unwrap();
 }
 
 async fn prepare_postgres(

core/lib/dal/Cargo.toml

@@ -45,7 +45,6 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 bigdecimal = "0.3.0"
 bincode = "1"
-num = "0.4.0"
 hex = "0.4"
 once_cell = "1.7"
 strum = { version = "0.24", features = ["derive"] }

core/lib/dal/src/models/mod.rs

@@ -7,7 +7,6 @@ pub mod storage_log;
 pub mod storage_protocol_version;
 pub mod storage_prover_job_info;
 pub mod storage_sync;
-pub mod storage_token;
 pub mod storage_transaction;
 pub mod storage_verification_request;
 pub mod storage_witness_job_info;