Fix/int 859

[roberto-butti]

Pull request type

Jira Link: INT-859

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Other (please describe):

How to test this PR

What is the new behavior?

Resolving nested relations.

This PR introduces the feature to resolve nested relations. We set a boolean to indicate to the algorithm to stop resolving the nested relations during the resolving relation. The PR allows tracking of the level of the nested relations.

For testing:

composer run test

Especially take a look at tests:

• "Integration: get one story with few resolved relations"
• "Integration: get one story with Resolved relations 1" in the file tests/Storyblok/Integration/ClientTest.php

[roberto-butti]

I'm going to close this PR. I will add a new PR that prevents resolving autoreferenced nested stories