orc-tools convert does not respect second fractions

{{% cat timestamp2.csv }}
2019-01-01 00:00:00.0000
2015-01-01 00:00:00.0001
2015-01-01 00:00:00.0000
2014-12-31 23:59:59.9999
1970-01-01 00:00:00.0001
1970-01-01 00:00:00.0000
1969-12-31 23:59:59.9999
1969-12-31 23:59:59.0001
1969-12-31 23:59:59.0000
1969-12-31 23:59:58.9999
% java -jar tools/target/orc-tools-1.6.0-SNAPSHOT-uber.jar convert --schema timestamp --timestampformat "yyyy-MM-dd HH:mm:ss.SSSS" timestamp2.csv -o timestamp2-tools16.orc

Reading back the file generated above excludes the second fractions (nanos).

Reason for this is that tools/convert/CsvReader.java (as well as tools/convert/JsonReader.java) do not consider the nanos.  They just create a Timestamp and never call setNanos() method on it (in this case with the result of a getNano() call to the ZonedDateTime.  This needs to be done in 4 places.  Unfortunately I am not allowed to make a contribution at this point, so I can only describe the problem.  I can confirm with a change/fix like that, the nanos are stored in the resulting ORC file.