Workflows API: new `List Strings on the Workflow Step` method

[andrii-bodnar]

The Workflows API (Crowdin Enterprise) has a new method to list strings on the workflow step. It should also be added to the Crowdin API clients.

References:

• List Strings on the Workflow Step

[imprvhub]

Hi! I'd like to work on this issue and implement the List Strings method for the Workflow Step API. Could I be assigned to it?

[imprvhub]

Hi @andrii-bodnar - PR is ready for review. Thanks for letting me contribute to this project!