chore(ln): add sync warning to ln common client getinfo response

lightning-commons/lightning-commons-client-cln/src/main/java/org/tbk/lightning/client/common/cln/ClnCommonClient.java

@@ -12,6 +12,7 @@
 
 import java.util.HexFormat;
 import java.util.List;
+import java.util.Optional;
 
 /**
  * See: <a href="https://docs.corelightning.org/reference">CLN API Docs</a>
@@ -41,6 +42,10 @@ public Mono<CommonInfoResponse> info(CommonInfoRequest request) {
                             .setNetwork(response.getNetwork())
                             .build())
                     .setBlockheight(response.getBlockheight())
+                    .setWarningBlockSync(Optional.of(response.getWarningBitcoindSync())
+                            .filter(it -> !it.isBlank())
+                            .or(() -> Optional.of(response.getWarningLightningdSync()).filter(it -> !it.isBlank()))
+                            .orElse(""))
                     .build();
         });
     }

lightning-commons/lightning-commons-client-core/src/main/java/org/tbk/lightning/client/common/core/core.proto

@@ -24,6 +24,8 @@ message CommonInfoResponse {
   // A list of active chains the node is connected to
   repeated Chain chain = 9 [json_name = "chains"];
   uint32 blockheight = 10 [json_name = "blockheight"];
+  // a warning if either bitcoin or lightning node is not yet synced to chain; can be empty.
+  string warning_block_sync = 11  [json_name = "warning_block_sync"];
 }
 
 message Chain {

lightning-commons/lightning-commons-client-lnd/src/main/java/org/tbk/lightning/client/common/lnd/LndCommonClient.java

@@ -72,6 +72,7 @@ public Mono<CommonInfoResponse> info(CommonInfoRequest request) {
                                     .build())
                             .toList())
                     .setBlockheight(response.getBlockHeight())
+                    .setWarningBlockSync(response.getSyncedToChain() ? "" : "Node is not synced to chain")
                     .build();
         });
     }