Add filter to disable page row actions

[sanketio]

Description of the Change

This PR introduces a new filter to disable the page row actions this plugin adds.

Closes #220

How to test the Change

1. Activate this plugin
2. Add this code into your theme's functions.php file:

add_filter( 'simple_page_ordering_allow_row_actions', '__return_false' );

3. Check the pages list in admin, and you should not see the page row actions this plugin is adding.

Changelog Entry

Added - New filter simple_page_ordering_allow_row_actions to disallow the new page row actions.

Credits

Props @sanketio

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[faisal-alvi]

@sanketio LGTM 👍🏻 Thanks for working on this.