Log signed vs unsigned for TLV payloads.

Right now we just log the number when the type is integer.  But people keep being
confused why things don't work when they messed up unsigned vs signed bits.  We should
just log that information.

Author: bzbarsky-apple

src/app/MessageDef/MessageDefHelper.cpp

@@ -140,7 +140,7 @@ CHIP_ERROR CheckIMPayload(TLV::TLVReader & aReader, int aDepth, const char * aLa
 
         // TODO: Figure out how to not use PRId64 here, since it's not supported
         // on all libcs.
-        PRETTY_PRINT_SAMELINE("%" PRId64 ", ", value_s64);
+        PRETTY_PRINT_SAMELINE("%" PRId64 " (signed), ", value_s64);
         break;
     }
 
@@ -151,7 +151,7 @@ CHIP_ERROR CheckIMPayload(TLV::TLVReader & aReader, int aDepth, const char * aLa
 
         // TODO: Figure out how to not use PRIu64 here, since it's not supported
         // on all libcs.
-        PRETTY_PRINT_SAMELINE("%" PRIu64 ", ", value_u64);
+        PRETTY_PRINT_SAMELINE("%" PRIu64 " (unsigned), ", value_u64);
         break;
     }