[Core] Add object-factory option to CLI and CucumberOptions

[ralphkar]

Summary

In order to provide different test configurations it might be useful to use different object factories when working with a DI framework. This is described in issue #1690.

Details

• The annotations for JUnit and TestNG now allow to specify the class to instantiate as object factory.
• A CLI flag has been added to allow the specification of an object factory on the command line (--object-factory).
• Some minor refactorings along the way.

Motivation and Context

• It is now possible to use different object factories in a Cucumber test suite. Features need to be separated (using tags) and can be grouped as separate tests that are annotated with different CucumberOptions.
• For each specification of CucumberOptions a different objectFactory can be specified. That way different feature tests can e.g. use differently configured injectors.
• It is no longer necessary to specify an object factory in cucumber.properties.
• Object factories are loaded via the ServiceLoader and need to be specified in the file META-INF/services/io.cucumber.core.backend.ObjectFactory. Multiple implementations can be given here.

How Has This Been Tested?

Unit tests have been added and a production test has been executed with our product.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist:

• I've added tests for my code.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[mpkorstanje]

Cheers looks good. Just a few small things.

[ralphkar]

I have made the requested changes. I think the PR is ready. Maybe at some point in the future someone should write a short abstract on how to use object factories in v5.

[mpkorstanje]

Cheers!

Maybe at some point in the future someone should write a short abstract on how to use object factories in v5.

You wouldn't be happen to volunteer? It doesn't need to be a full blown doc. A short brief in a readme of the core module will do.

[ralphkar]

Maybe at some point in the future someone should write a short abstract on how to use object factories in v5.

You wouldn't be happen to volunteer? It doesn't need to be a full blown doc. A short brief in a readme of the core module will do.

As requested -> #1715