fix(air): demote some AquaVM logging statements (#505)

Users complain that `warn` level produces lot of unnecessary logs.

+ join behavior logging is demoted to `trace`;
+ xor logging is demoted to `trace`;
+ service error logging is demoted to `debug`.

air/src/execution_step/errors/catchable_errors.rs

@@ -125,7 +125,7 @@ impl LastErrorAffectable for CatchableError {
 
 macro_rules! log_join {
     ($($args:tt)*) => {
-        log::info!(target: air_log_targets::JOIN_BEHAVIOUR, $($args)*)
+        log::trace!(target: air_log_targets::JOIN_BEHAVIOUR, $($args)*)
     }
 }