[CLI] parametrised queries: give the option to join the output

[enridaga]

At the moment, parameterized queries (using options -v,-i,-p) are producing separate output/files for each one of the input bindings. It would be useful to give the user the opportunity to get them all in the same resultset/graph/file

[enridaga]

This may be trivial for some formats:

• Turtle (and Star...)
• N-Quads (and Star...)
• N-Triples (and Star...)
• Trig (and Star...)

Also, raise an error or stop if any other format is requested. Future work (issues to open) is to add support for tabular data output (CSV only)

[enridaga]

Other formats may require to join the whole data in memory, which could be problematic in some scenarios (but we can still support it)