Support arguments in load_plugin()

[iynehz]

See

p5-Devel-IPerl/lib/IPerl.pm

Line 40 in 0f9fe2f

my ($class, $plugin_name) = @_;

Now this load_plugin method does not support arguments. It would be best to support arguments like my ($class, $plugin_name, @args) = @_, and register plugins by $plugin_package->register( $class, @args );, so plugin developer can have arguments to fine control behavior of their plugins.

One use case is pablrod/p5-Devel-IPerl-Plugin-Chart-Plotly#7