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/tmtc/mod.rs

@@ -20,8 +20,6 @@ pub use ccsds_distrib::{CcsdsDistributor, CcsdsError, CcsdsPacketHandler};
 #[cfg(feature = "alloc")]
 pub use pus_distrib::{PusDistributor, PusServiceProvider};
 
-pub type TargetId = u32;
-
 /// Generic trait for object which can receive any telecommands in form of a raw bytestream, with
 /// no assumptions about the received protocol.
 ///