Add suggested changes to variant / evidence / gene / assertion endpoints.

[ahwagner]

Currently all of the listed entities return detailed information in batches from advanced search endpoints. However, the only way to get suggested_changes is still through the GET :entity_id/suggested_changes endpoints, returning suggested_changes for only one entity at a time.

An option to include the suggested_changes in the advanced search response, or a batch (POST) endpoint for suggested_changes would alleviate this.