Add add-data url and handler

[dracco1993]

Description

Add /add-data url and handler

Motivation and Context

More py3

How Has This Been Tested?

Locally

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change API specifications or require data migrations)

[codecov]

Codecov Report

Merging #4660 (2892452) into py3 (522baf5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              py3    #4660   +/-   ##
=======================================
  Coverage   71.22%   71.22%           
=======================================
  Files           8        8           
  Lines         344      344           
  Branches       60       60           
=======================================
  Hits          245      245           
  Misses         91       91           
  Partials        8        8           

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