[feature]: Harvest Timetracking Integration

[schrader]

Is there an existing issue for this?

• [x] I have searched the existing issues

Summary

I'd love to be able to use Harvest to track time on Plane work items.

Integration seems quite simple using the Harvest Button or Widget: https://www.getharvest.com/add-time-tracking

Why should this be worked on?

Logging and reporting time in Plane is quite cumbersome, and we have years-long great experience with Harvest, so we'd like to continue using the tool even when using Plane (and not Asana/Basecamp anymore, which both support being “harvested”).