registerCustomStep method
Registers a custom step
with the registry. If a custom step is already
registered with the same ultimate id then it will be replaced with this.
If a built in step is registered with the same ultimate id then this will
shadow the built in step such that this step will now be used in place of
the built in step.
Implementation
void registerCustomStep(TestStepBuilder step) =>
_customSteps[step.availableTestStep.id] = step;