[FEAT]: runner - add/enhance callback API for custom reporters

[dgrebb]

This is built into playwright, and could potentially be included as an abstraction API for the config file.

Request: https://github.com/garris/BackstopJS/issues/1521

Research & Notes

• https://playwright.dev/docs/test-reporters
• https://www.npmjs.com/package/cli-progress
• https://github.com/ivanseidel/node-draftlog
• https://blog.bitsrc.io/build-a-command-line-progress-bar-in-node-js-5702a3525a49