feat: add live sync retry backoff

crates/geth-control/src/lib.rs

@@ -1698,6 +1698,12 @@ pub struct SyncStreamStatus {
     pub last_error: Option<String>,
     pub last_imported: usize,
     pub last_rejected: usize,
+    #[serde(default)]
+    pub consecutive_failures: u32,
+    #[serde(default)]
+    pub retry_after_ms: Option<i64>,
+    #[serde(default)]
+    pub retry_in_ms: Option<i64>,
     pub next_action: String,
 }
 
@@ -2719,6 +2725,9 @@ mod tests {
                     last_error: None,
                     last_imported: 2,
                     last_rejected: 0,
+                    consecutive_failures: 0,
+                    retry_after_ms: None,
+                    retry_in_ms: None,
                     next_action: "none".to_owned(),
                 }],
             }],