fix(wallet-grpc): return correct available balance and add timelocked…

…_balance (#5181)

Description
---
get_balance call to returns timelocked_balance
get_balance call returns funds that are immediately spendable

Motivation and Context
---
Calls to get_balance seemingly do not yield the correct balance, e.g your wallet ui says available balance == 0 but the grpc call says available_balance > 0 (because it includes the timelocked funds). This PR changes the available_balance to reflect the amount of funds immediately spendable. This only happens on the grpc level to avoid a breaking change in other code (FFI etc)

How Has This Been Tested?
---
Existing cucumber. Tested with VN that queries the balance.

<!-- Does this include a breaking change? If so, include this line as a footer -->
BREAKING CHANGE: get_balance grpc call has changed, available_balance no longer includes timelocked funds only immediately available funds. This probably only is used currently in cucumber tests.

applications/tari_app_grpc/proto/wallet.proto

@@ -232,6 +232,7 @@ message GetBalanceResponse {
     uint64 available_balance = 1;
     uint64 pending_incoming_balance = 2;
     uint64 pending_outgoing_balance = 3;
+    uint64 timelocked_balance = 4;
 }
 
 message GetUnspentAmountsResponse {

applications/tari_console_wallet/src/grpc/wallet_grpc_server.rs

@@ -266,9 +266,13 @@ impl wallet_server::Wallet for WalletGrpcServer {
             Err(e) => return Err(Status::not_found(format!("GetBalance error! {}", e))),
         };
         Ok(Response::new(GetBalanceResponse {
-            available_balance: balance.available_balance.0,
+            available_balance: balance
+                .available_balance
+                .saturating_sub(balance.time_locked_balance.unwrap_or_default())
+                .0,
             pending_incoming_balance: balance.pending_incoming_balance.0,
             pending_outgoing_balance: balance.pending_outgoing_balance.0,
+            timelocked_balance: balance.time_locked_balance.unwrap_or_default().0,
         }))
     }