chore: reorganize rust crates

lib/libpk/src/state.rs

@@ -1,12 +0,0 @@
-#[derive(serde::Serialize, serde::Deserialize, Clone, Default)]
-pub struct ShardState {
-    pub shard_id: i32,
-    pub up: bool,
-    pub disconnection_count: i32,
-    /// milliseconds
-    pub latency: i32,
-    /// unix timestamp
-    pub last_heartbeat: i32,
-    pub last_connection: i32,
-    pub cluster_id: Option<i32>,
-}