Log detailed correlated consensus data together (#5302)

Combine multiple related debug log data points into a single
message. Allows quick correlation of events that
previously were either not logged or, if logged, strewn
across multiple lines, making correlation difficult.
The Heartbeat Timer and consensus ledger accept processing
each have this capability.

Also guarantees that log entries will be written if the
node is a validator, regardless of log severity level.
Otherwise, the level of these messages is at INFO severity.

include/xrpl/beast/utility/Journal.h

@@ -112,6 +112,16 @@ public:
         virtual void
         write(Severity level, std::string const& text) = 0;
 
+        /** Bypass filter and write text to the sink at the specified severity.
+         * Always write the message, but maintain the same formatting as if
+         * it passed through a level filter.
+         *
+         * @param level Level to display in message.
+         * @param text Text to write to sink.
+         */
+        virtual void
+        writeAlways(Severity level, std::string const& text) = 0;
+
     private:
         Severity thresh_;
         bool m_console;

include/xrpl/beast/utility/WrappedSink.h

@@ -93,6 +93,13 @@ public:
         using beast::Journal;
         sink_.write(level, prefix_ + text);
     }
+
+    void
+    writeAlways(severities::Severity level, std::string const& text) override
+    {
+        using beast::Journal;
+        sink_.writeAlways(level, prefix_ + text);
+    }
 };
 
 }  // namespace beast