Allow passing of primary options as arguments in command line

[nichtich]

Why can't I just type

catmandu import JSON test.json to DBI dbi:SQLite:test.sqlite

The primary and most common option to Catmandu::Importer is file and the primary, mandatory option to Catmandu::Store is data_source, so the call above should be expanded to

catmandu import JSON --file test.json to DBI --data_source dbi:SQLite:test.sqlite

Typical usage should be simple and non-typical usage should be possible.