Move io.cucumber.core.api.Scenario to backend implementation

[mpkorstanje]

Summary

With the introduction of JPMS modules need to declare their dependencies. Additionally they need to declare which transitive modules their consumers have to depend on via require transitive. To keep this structure simple we should remove the need to end users to depend on cucumber-core.

So:

• Replace io.cucumber.core.api.Scenario with io.cucumber.java.Scenario and io.cucumber.java8.Scenario
• Deprecate TypeRegistry and TypeRegistryConfigurer in favor of the @ParameterType annotation and friends.

Expected Behavior

package io.cucumber.examples.java;

import io.cucumber.java.Scenario;
import io.cucumber.java.After;
import io.cucumber.java.Before;

public class RpnCalculatorSteps {
    private RpnCalculator calc;

    @Before("not @foo")
    public void before(Scenario scenario) {

    }

    @After
    public void after(Scenario scenario) {
    }
}

Current Behavior

package io.cucumber.examples.java;

import io.cucumber.core.api.Scenario;
import io.cucumber.java.After;
import io.cucumber.java.Before;

public class RpnCalculatorSteps {
    private RpnCalculator calc;

    @Before("not @foo")
    public void before(Scenario scenario) {

    }

    @After
    public void after(Scenario scenario) {
    }
}

Possible Solution

1. Add io.cucumber.core.backend.Scenario and make it extend io.cucumber.java.Scenario. This will be the scenario representation that Cucumber uses to it's internal components.

2. Add io.cucumber.java.Scenario that extends io.cucumber.core.api.Scenario. This will be the scenario representation the cucumber-java module uses to the end user.

3. Deprecate io.cucumber.core.api.Scenario and eventually remove it.