Split tablesort.module.css out to its own library and attach it via tablesort

Problem/Motivation

See #3432183: Move system/base component CSS to respective libraries where they exist.

tablesort.module.css is in system/base but it could probably be in its own library, then attached when building tabledrag tables (which are not usually on every page, or even many pages).

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet