fix: Replace charge() by fee_.update() in OnMessage functions (#5269)

In PeerImpl.cpp, if the function is a message handler (onMessage) or called directly from a message handler, then it should use fee_, since when the handler returns (OnMessageEnd) then the charge function is called. If the function is not a message handler, such as a job queue item, it should remain charge.

include/xrpl/resource/Charge.h

@@ -57,6 +57,9 @@ public:
     std::strong_ordering
     operator<=>(Charge const&) const;
 
+    Charge
+    operator*(value_type m) const;
+
 private:
     value_type m_cost;
     std::string m_label;