Include token owners in TransactionTokenBalances (#20642)

* Cache owners in TransactionTokenBalances

* Light cleanup

* Use return struct, and remove pub

* Single-use statements

* Why not, just do the whole crate

* Add metrics

* Make datapoint_debug to prevent spam unless troubleshooting

ledger/src/blockstore.rs

@@ -8361,6 +8361,7 @@ pub mod tests {
                     amount: "11".to_string(),
                     ui_amount_string: "1.1".to_string(),
                 },
+                owner: Pubkey::new_unique().to_string(),
             }]),
             post_token_balances: Some(vec![TransactionTokenBalance {
                 account_index: 0,
@@ -8371,6 +8372,7 @@ pub mod tests {
                     amount: "11".to_string(),
                     ui_amount_string: "1.1".to_string(),
                 },
+                owner: Pubkey::new_unique().to_string(),
             }]),
             rewards: Some(vec![Reward {
                 pubkey: "My11111111111111111111111111111111111111111".to_string(),