Overview: Pager module

[eliot-akira]

The new Pager module is an upgrade from the Paginator module (v1). The latter has limitations due to its design, such as only supporting post loops and somewhat fixed structure of pagination.

• Features to support described in Overview: Pager module #21
• Rewrite in TypeScript
• Use React/Preact or vanilla JS for pager elements instead of jQuery
• Use API module using fetch instead of AJAX module using jQuery.ajax
• Accessibility
• Support any loop type
• Support dynamic loading, for example, in page builder preview
• Separate general-purpose functionality to Framework

[eliot-akira]

Consolidated to #21.