HPCC-9481 CSV record definition auto discovery

Part I.

Add
- implementation for CSV record structure discover
- new parameter to signal CSV file contains field definition in first row
- new parameter handling to WU enviromnet
- new parameter handling to DFUPlus

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
HPCC-9481 CSV record definition auto discovery

Part I.

Add
- implementation for CSV record structure discover
- new parameter to signal CSV file contains field definition in first row
- new parameter handling to WU enviromnet
- new parameter handling to DFUPlus

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge branch 'HPCC-9481-feature' of github.com:AttilaVamos/HPCC-Platform into HPCC-9481-feature

Conflicts:
	dali/ft/daftformat.cpp
	dali/ft/daftformat.ipp
	dali/ft/filecopy.cpp

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
HPCC-9481 CSV record definition auto discovery

Rework aftewr second review.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #4835 from AttilaVamos/HPCC-9481-feature

HPCC-9481 CSV record definition auto discovery

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>