Module should expose Tabled library options on config page

Problem/Motivation

The Tabled library has several options to configure it, but users of CKEditor Responsive Table have no way to leverage these options without re-instantiating the library themselves.

Steps to reproduce

1. Go to /admin/config/content/ckeditor-responsive-table
2. Notice the lack of Tabled configuration options

Proposed resolution

Expose relevant Tabled configuration options in the CKEditor Responsible Table configuration page, at /admin/config/content/ckeditor-responsive-table.

Not all options make sense to expose. These are the ones I propose.

• failClass
• captionSide
• characterThresholdLarge
• characterThresholdSmall

These options should be saved and then passed to the Tabled library instantiation.

User interface changes

UI changes are to the configuration page, adding a field for each configuration option.