Improving the `StateMachine` view in `vcd`

[chykon]

Motivation

When viewing vcd StateMachine is split into sequential and combinational, which introduces a bit of chaos due to the lack of context. It is better to let the user immediately see which module these blocks belong to.

Desired solution

1. Generate the statemachine module, inside which the sequential and combinational blocks will be located.
2. Add the ability to set a name for StateMachine (the default value can be statemachine).

Alternatives considered

No response

Additional details

No response

[mkorbel1]

Great suggestion. I think something similar might be nice for Pipeline as well.

As a note, it will require a little overhead in the implementation to properly generate inputs and outputs to the new module. For example, instead of passing List<Conditional>s directly into the Combinational blocks, they will have to be recreated using inputs and outputs of the module.