feat(spider-storage): Add scheduler registration protocols and MariaDB implementation.

components/spider-core/src/types.rs

@@ -1,2 +1,3 @@
 pub mod id;
 pub mod io;
+pub mod scheduler;

components/spider-core/src/types/scheduler.rs

@@ -0,0 +1,11 @@
+use std::net::IpAddr;
+
+use crate::types::id::SchedulerId;
+
+/// The currently registered scheduler endpoint.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct RegisteredScheduler {
+    pub id: SchedulerId,
+    pub ip_address: IpAddr,
+    pub port: u16,
+}