Create Endpoint to export or Download filtered reported trait result in CSV or other formats

[sprintell]

Description:
As developer
I want an api endpoint
So that I can download filtered list of reported traits in csv or other formats

Management Rules:
Rule 1: Endpoint - /v1/reported-traits/export
Rule 2: HTTP Request Method - GET
Rule 3: Endpoint should accept filter, and sort parameters as in /v1/reported-export?trait=...&size=20&sort=name,desc
Rule 4: Endpoint should trigger download of binary file according to specified format (csv)

Acceptance Tests:
Given no parameter
When the front end sends a get request to the endpoint
Binary file containing all reported traits should be downloaded

Given sorting, and/or some search and filter parameters
When the front end sends a get request to the endpoint
Binary file containing filtered list of reported traits satisfying the conditions in the url parameter must be returned

[ljwh2]

Not part of standard workflow. Should not be too much work to add.