Harvest model updates

[atruskie]

add field last_metadata_review_at add field last_mapping_change_at rename field latest_activity to lastest_activity_at rename field last_upload_date to last_upload_date_at add create harvest capability to project model

Fixes #583

• [x] Assign reviewers if you have permission
• [x] Assign labels if you have permission
• [x] Link issues related to PR
• [x] Remove/Reduce warnings from edited files
• [x] Unit tests have been added for changes
• [ ] Ensure CI build is passing