Fix nested filters when generating examples for PHP, JS and Python

[AdamiecRadek]

This PR changes the way of generating examples for languages PHP, JS, and Python
Previously there was an issue when you had nested filters defined for your route like

[
  'data' => 'filled|array',
  'data.*' => 'required|array',
  'data.*.is_file' => 'required|boolean',
]

Possible connected issue: #308 and #455

Now Scribe will nicely generate examples for them.

[shalvah]

No idea why I didn't have a test for this class already, so thanks for this. Now I need to add tests for the other things in that file.😅