DBIx::DataModel::ConnectedSource - metasource and schema paired together
A connected source is a pair of a $schema and $meta_source.
The meta_source holds information about the data structure,
and the schema holds a connection to the database.
Methods are documented in "CONNECTED SOURCES" in DBIx::DataModel::Doc::Reference
my $connected_source
= DBIx::DataModel::ConnectedSource->new($meta_source, $schema);
