Added high-level abstraction for some PUS services

Introduced high-level abstractions for targetable requests in general.

- PUS Service 3 (HK) abstraction for targetable HK requests
- PUS Service 8 (Action) abstraction for targetable action requests

satrs/src/hk.rs

@@ -1,3 +1,8 @@
+use crate::{
+    pus::verification::{TcStateAccepted, VerificationToken},
+    TargetId,
+};
+
 pub type CollectionIntervalFactor = u32;
 pub type UniqueId = u32;
 
@@ -11,6 +16,25 @@ pub enum HkRequest {
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub struct TargetedHkRequest {
-    target: u32,
-    hk_request: HkRequest,
+    pub target_id: TargetId,
+    pub hk_request: HkRequest,
+}
+
+impl TargetedHkRequest {
+    pub fn new(target_id: TargetId, hk_request: HkRequest) -> Self {
+        Self {
+            target_id,
+            hk_request,
+        }
+    }
+}
+
+pub trait PusHkRequestRouter {
+    type Error;
+    fn route(
+        &self,
+        target_id: TargetId,
+        hk_request: HkRequest,
+        token: VerificationToken<TcStateAccepted>,
+    ) -> Result<(), Self::Error>;
 }