feat: add Koko Analytics for view tracking

[greatislander]

• [x] I've read the guidelines for Contributing to the Platform Co-op Toolkit
• [x] This isn't a duplicate of an existing pull request

Description

Koko Analytics is a privacy-focused, locally-hosted analytics plugin for WordPress. This PR adds it as a plugin dependency, and we can use it to track views for resources and sort by views.

Steps to test

1. Check out this branch.

Expected behavior: Koko Analytics is installed and activated.

Additional information

Not applicable.

Related issues

Not applicable.