feature request: rrweb canvas tracking

Hey,
currently im in a need of tracking interactions with canvas elements which current openpanel rrweb setup does not allow. There are few options according to their docs here https://github.com/rrweb-io/rrweb/blob/master/docs/recipes/canvas.md.

Ideal setup from my point of view would be to allow selfhosting users to set it up in their own way.

More specifically:

• let users create
  • config-api.js/config-api.ts
  • config-panel.js/config-panel.ts
• expose config utils to setup the openpanel through javascript/typescript in said config files
• load said config files upon start of api or the admin panel

This would allow not only custom config for rrweb but also a way to customize more things related to other functionalities. It would definitely be a successor to the numerous of env vars.

WDYT? Im open to create first draft of implementation - either the proposed config or a simple way to enable the canvas recording/replay

Start with the linked rrweb canvas recipe and inspect how the API and admin panel currently initialize rrweb and other configuration. Compare the proposed config-api.js/config-api.ts and config-panel.js/config-panel.ts approach with the simpler canvas recording/replay option. Done criteria need to be agreed: the issue does not yet choose an implementation or identify existing files and tests.