implement private _run_command in Collection
implement private _run_command in Collection

This private command runner uses the Collection's bson_codec, rather
than the originating Database object codec.

gormanb/mongo-perl-driver,dagolden/mongo-perl-driver,mongodb/mongo-perl-driver,gormanb/mongo-perl-driver,dagolden/mongo-perl-driver,dagolden/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,mongodb/mongo-perl-driver,jorol/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,xdg/mongo-perl-driver,xdg/mongo-perl-driver,dagolden/mongo-perl-driver,jorol/mongo-perl-driver,kainwinterheart/mongo-perl-driver,mongodb/mongo-perl-driver,jorol/mongo-perl-driver,xdg/mongo-perl-driver,kainwinterheart/mongo-perl-driver,kainwinterheart/mongo-perl-driver,gormanb/mongo-perl-driver,kainwinterheart/mongo-perl-driver,gormanb/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,jorol/mongo-perl-driver