add basic subservices

satrs-core/src/pus/hk.rs

@@ -1,2 +1,8 @@
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
-pub enum Subservice {}
+pub enum Subservice {
+    EnableGeneration = 5,
+    DisableGeneration = 6,
+    HkPacket = 25,
+    GenerateOneShotHk = 27,
+    ModifyCollectionInterval = 31,
+}