[CARBONDATA-4322] Apply local sort task level property for insert

[CARBONDATA-4322] Apply local sort task level property for insert

Why is this PR needed?
Currently, When carbon.partition.data.on.tasklevel is enabled with
local sort, the number of tasks launched for load will be based on
node locality. But for insert command, the local sort task level
property is not applied which is causing the number of tasks
launched based on the input files.

What changes were proposed in this PR?
Included changes to apply carbon.partition.data.on.tasklevel property
for insert command as well. Used DataLoadCoalescedRDD to coalesce
the partitions and a DataLoadCoalescedUnwrapRDDto unwrap partitions
from DataLoadPartitionWrap and iterate.

Does this PR introduce any user interface change?
No

Is any new testcase added?
Yes

This closes #4248