[CLI] Support output file patterns with variables placed in directory names

[enridaga]

For example, the following does not currently work:

 fx -q fx/generate-turtles.sparql -v database/listening-experiences.csv -p "database/?id/graph.ttl"

where id is one of the CSV column names passed in -v.

Enabling debug log we can see the details:

java.io.FileNotFoundException: database/1431361600838/graph.ttl (No such file or directory)
	at java.base/java.io.FileOutputStream.open0(Native Method)
	at java.base/java.io.FileOutputStream.open(FileOutputStream.java:293)
	at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:235)
	at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:155)
	at io.github.sparqlanything.cli.SPARQLAnything.getPrintStream(SPARQLAnything.java:194)
	at io.github.sparqlanything.cli.SPARQLAnything.executeQueryWithValues(SPARQLAnything.java:580)
	at io.github.sparqlanything.cli.SPARQLAnything.main(SPARQLAnything.java:527)