Simplify the flow of execution of light-base/sync/relay (#1383)

* Inline `process_foreground_messages`

* No longer have this weird `response_outcome`variable

* Inline `inject_network_event`

* Integrate the network state update within the WakeUpReason

* Inline the request results match block

* Inline `start_next_request`

* Get the desired request ahead of time to fix compilation

* Add TODO

lib/src/sync/all.rs

@@ -1878,13 +1878,15 @@ pub enum DesiredRequest {
 
 impl DesiredRequest {
     /// Caps the number of blocks to request to `max`.
+    // TODO: consider removing due to the many types of requests
     pub fn num_blocks_clamp(&mut self, max: NonZeroU64) {
         if let DesiredRequest::BlocksRequest { num_blocks, .. } = self {
             *num_blocks = NonZeroU64::new(cmp::min(num_blocks.get(), max.get())).unwrap();
         }
     }
 
     /// Caps the number of blocks to request to `max`.
+    // TODO: consider removing due to the many types of requests
     pub fn with_num_blocks_clamp(mut self, max: NonZeroU64) -> Self {
         self.num_blocks_clamp(max);
         self