Helper Class based on 
Row, it provides Metadata associated with each Record when reading
 from file(s) using 
ContextualTextIO.
 
Fields:
 
   - recordValue: The value / contents of the record VALUE
- resourceId: A resource descriptor representing which resource the record belongs to. See
   
- recordNum: The ordinal number of the record in its file. RECORD_NUMResourceIdRowfor details.
- rangeOffset: The starting offset of the range (split), which contained the record, when the
       record was read. RANGE_OFFSET
- recordNumInOffset: The record number relative to the Range. (line number within the range)
       RECORD_NUM_IN_OFFSET
- recordOffset: The offset of a record (the byte at which the record begins) in a file. This
       information can be useful if you wish to reconstruct the file. RANGE_OFFSET