Add Detailed Metrics on Results

[bigerl]

Those could include:

• ContentLength ( in Bytes)
• NumberOfSolutions ( = number of rows in result table)
• NumberOfBindings ( = number of non-empty cells in result table )
• NumberOfVariables ( = number of columns/column heads )

Example

x	y
1
2	1
3	1

NOV = 2 NOB = 5 NOS = 3

[nck-mlcnv]

see SaxSparqlJsonResultCountingParser class