Improvements for example and documentation

- Added diagrams for sat-rs example for both structure and data flow.
- Added explanations for those diagrams as well.
- Some renaming: Use `Pool` instead of `Store` for pool components.
- General improvements for satrs-book.

satrs-core/tests/pus_verification.rs

@@ -1,4 +1,4 @@
-#[cfg(feature = "crossbeam")]
+//#[cfg(feature = "crossbeam")]
 pub mod crossbeam_test {
     use hashbrown::HashMap;
     use satrs_core::pool::{
@@ -9,7 +9,7 @@ pub mod crossbeam_test {
         FailParams, RequestId, VerificationReporterCfg, VerificationReporterWithSender,
     };
     use satrs_core::pus::CrossbeamTmInStoreSender;
-    use satrs_core::tmtc::tm_helper::SharedTmStore;
+    use satrs_core::tmtc::tm_helper::SharedTmPool;
     use spacepackets::ecss::tc::{PusTcCreator, PusTcReader, PusTcSecondaryHeader};
     use spacepackets::ecss::tm::PusTmReader;
     use spacepackets::ecss::{EcssEnumU16, EcssEnumU8, PusPacket, WritablePusPacket};
@@ -37,12 +37,12 @@ pub mod crossbeam_test {
         let cfg = VerificationReporterCfg::new(TEST_APID, 1, 2, 8).unwrap();
         // Shared pool object to store the verification PUS telemetry
         let pool_cfg = StaticPoolConfig::new(vec![(10, 32), (10, 64), (10, 128), (10, 1024)]);
-        let shared_tm_store = SharedTmStore::new(StaticMemoryPool::new(pool_cfg.clone()));
+        let shared_tm_pool = SharedTmPool::new(StaticMemoryPool::new(pool_cfg.clone()));
         let shared_tc_pool_0 = Arc::new(RwLock::new(StaticMemoryPool::new(pool_cfg)));
         let shared_tc_pool_1 = shared_tc_pool_0.clone();
         let (tx, rx) = crossbeam_channel::bounded(10);
         let sender =
-            CrossbeamTmInStoreSender::new(0, "verif_sender", shared_tm_store.clone(), tx.clone());
+            CrossbeamTmInStoreSender::new(0, "verif_sender", shared_tm_pool.clone(), tx.clone());
         let mut reporter_with_sender_0 =
             VerificationReporterWithSender::new(&cfg, Box::new(sender));
         let mut reporter_with_sender_1 = reporter_with_sender_0.clone();
@@ -145,7 +145,7 @@ pub mod crossbeam_test {
                     .recv_timeout(Duration::from_millis(50))
                     .expect("Packet reception timeout");
                 let tm_len;
-                let shared_tm_store = shared_tm_store.clone_backing_pool();
+                let shared_tm_store = shared_tm_pool.clone_backing_pool();
                 {
                     let mut rg = shared_tm_store.write().expect("Error locking shared pool");
                     let store_guard = rg.read_with_guard(verif_addr);