Add RetrieveModel endpoint

Closes #1374 (closed)

changed milestone to %Arkindex 1.3.6

requested review from @babadie

assigned to @erwanrouchet

mentioned in merge request frontend!1405 (merged)

added 5 commits

• 03965e13...98f82597 - 2 commits from branch master
• 3f358776 - Remove _deserialize methods in model API tests
• 2fccded6 - Add RetrieveModel
• 0392ada9 - Update tests

Compare with previous version

merged