fix(posts): add a wrapper to have custom selectorCallback

[Arukuen]

fixes #3421
fixes #3422

• The selectorCallback in posts/style.js affects all block styles turning all the selectors to ‘.stk-img-wrapper’, without the appropriate additional selector definition.
  • First Approach: Change the base selector to the return value of selectorCallback. But this requires the getAttributeFunc in the image/style.js which might not be a clean approach.
  • Used Approach: Wrap selectorCallback and pass the selector. This allow custom selectorCallback per block style.

[github-actions]

🤖 Pull request artifacts

file	commit
pr3427-stackable-3427-merge.zip	b362bc5

[github-actions]

Try this Pull Request in the WordPress playground: https://playground.wordpress.net/?mode=seamless#{"landingPage":"/wp-admin/post-new.php?post_type=page","preferredVersions":{"php":"latest","wp":"latest"},"steps":[{"step":"login","username":"admin","password":"password"},{"step":"installPlugin","pluginZipFile":{"resource":"url","url":"https://raw.githubusercontent.com/gambitph/Stackable/artifacts/pr3427-stackable-3427-merge.zip"}}]}