feature: add MastForest::advice_map and load it before the execution

When merging forests, merge their advice maps and return error on key
collision.

core/src/mast/serialization/mod.rs

@@ -30,6 +30,8 @@ use decorator::{DecoratorDataBuilder, DecoratorInfo};
 use string_table::{StringTable, StringTableBuilder};
 use winter_utils::{ByteReader, ByteWriter, Deserializable, DeserializationError, Serializable};
 
+use crate::AdviceMap;
+
 use super::{DecoratorId, MastForest, MastNode, MastNodeId};
 use crate::AdviceMap;