feat(api): Log info about estimated fee (#1611)

## What ❔

Logs some info about estimated fee in API

## Why ❔

To be able to check how some transactions are estimated

## Checklist

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- [ ] 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 `zk fmt` and `zk lint`.
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- [ ] Linkcheck has been run via `zk linkcheck`.

core/lib/zksync_core/src/api_server/tx_sender/mod.rs

@@ -917,6 +917,14 @@ impl TxSender {
                 }
             };
 
+        tracing::info!(
+            initiator = ?tx.initiator_account(),
+            nonce = %tx.nonce().unwrap_or(Nonce(0)),
+            "fee estimation: gas for pubdata: {}, tx body gas: {tx_body_gas_limit}, overhead gas: {overhead} \
+            (with params base_fee: {base_fee}, gas_per_pubdata_byte: {gas_per_pubdata_byte})",
+            (tx_metrics.pubdata_published as u64) * gas_per_pubdata_byte,
+        );
+
         Ok(Fee {
             max_fee_per_gas: base_fee.into(),
             max_priority_fee_per_gas: 0u32.into(),