MCOL-4177 Add support for bulk insertion for wide decimals.

1. This patch adds support for wide decimals with/without scale
     to cpimport. In addition, INSERT ... SELECT and LDI are also
     now supported.
  2. Logic to compute the number of bytes to convert a binary
     representation in the buffer to a narrow decimal is also
     simplified.

writeengine/bulk/we_columninfo.cpp

@@ -204,6 +204,7 @@ ColumnInfo::ColumnInfo(Log*             logger,
         case WriteEngine::WR_ULONGLONG:
         case WriteEngine::WR_UMEDINT:
         case WriteEngine::WR_UINT:
+        case WriteEngine::WR_BINARY:
         default:
         {
             fColExtInf = new ColExtInf(column.mapOid, logger);