serverless-workflow

What would you like to be added:
Need to standardize on using embedded struct or embedded interface, with the latter preferred.
E.g. OperationState embeds struct BaseState instead of interface State, whilst, EventBaseSwitchState.EventConditions embeds interface EventCondition instead of struct BaseEventCondition.

Why is this needed:
With the various States - e.g. `Op

What would you like to be added:
Add more options to diagram generation. Some ideas include

1. add option to display diagram vertically/horizontally
2. add option to define the min/max size of the generated diagram
3. add ability to display actions (service invocations)
4. add custom node representations for different states
   Why is this needed:
   to improve diagram generation

What would you like to be added:

Create a test to verify the sdk behaviour in the browser.

Why is this needed:

Nowadays the only way we have to verify that the sdk is working in the browser is to test it by hand. See /examples/browser

Would be nice to have tests to verify the skd behaviour in the browser.