Smash serai-client so the processors don't need the entire lib to access their specific code

We prior controlled this with feature flags. It's just better to define their
own crates.

processor/monero/src/primitives/block.rs

@@ -8,7 +8,7 @@ use monero_wallet::{
   GuaranteedScanner,
 };
 
-use serai_client::networks::monero::Address;
+use serai_client_monero::Address;
 
 use primitives::{ReceivedOutput, EventualityTracker};
 use crate::{