There are multiple overloaded version of the low level DML write methods to
push down CSC column type. WE needs the type to convert values correctly.
Replaced WE_INT128 with CSC data type that is more informative.
Removed commented and obsolete code.
Replaced switch-case blocks with oneliners.
When the API inserts data into ColumnStore which will roll over into a
new extent that data wasn't being put into the new extent and corruption
occured. This patch now tracks the additional data and inserts it into
the new extent. It also makes sure the LBIDs are stored so that they are
correctly committed.
