importccl: replace the undocumented data format MYSQLOUTFILE with DELIMITED #40482
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MYSQLOUTFILE was originally used to help a client import data that was
not in csv proper format. This turns out to be useful for other users so
we call the new format DELIMITED. It's very fast and simple format for importing
delimited data disregarding issues with quoting. For example the csv format forbids
field1,fieldsth2
as such fields that contain quotes have to be enclosed inquotes themselves. The whole format is fully described here
https://dev.mysql.com/doc/refman/8.0/en/load-data.html.
Fixes #39820.
Release note (cli change): add a new IMPORT DATA format DELIMITED.