[JacMachine] Spawn Archetype by name

[ChrisIsKing]

The current JacMachine VM facilities the ability to handle the VM-related functionalities on loaded jac programs such as listing and updating walkers, nodes etc e.g

import:py from jaclang.runtimelib.machine {JacMachine}

walker test_walker {

    can visit_nodes with `root entry {
        visit [-->](`?test_node);
    }
}

walker child_walker :test_walker: {}

node test_node {
    has value:int;

    can print_value with test_walker entry {
        print("Value:", f'{self.value}');
    }
}

with entry {
    modules = JacMachine.get().list_modules();
    print(modules);
    nodes = JacMachine.get().list_nodes('__main__');
    print(nodes);
}

A needed extension of the JacMachine is the ability to spawn/instantiate defined archetypes, particularly nodes and walkers for now. This should be easily extensible to edges and jac objects as they are all python classes. A desired interface would look like the following:

import:py from jaclang.runtimelib.machine {JacMachine}

walker test_walker {

    can visit_nodes with `root entry {
        visit [-->](`?test_node);
    }
}

walker child_walker :test_walker: {}

node test_node {
    has value:int;

    can print_value with test_walker entry {
        print("Value:", f'{self.value}');
    }
}

with entry {
    for value in range(10) {
        root ++> test_node(value=value);
    }
    modules = JacMachine.get().list_modules();
    print(modules);
    nodes = JacMachine.get().list_nodes('__main__');
    print(nodes);
    node_obj = JacMachine.get().spawn_node('test_node', {'value': 42});
    node_obj.print_value();
    walker_obj = JacMachine.get().spawn_walker('child_walker');
    root spawn walker_obj;
}

[ChrisIsKing]

I just updated the interface from create_ to spawn_. Let's save create for undefined archetypes. Spawn will be the interface for already defined archetypes.