Add a post api endpoint to do load a set of mapping from a json file

[syphax-bouazzouni]

Requirement

• Add a post endpoint to send a file called /mappings/load
• Only connected users can send a file (the apikey request parameter is mandatory), they will the creators of the mappings
• Mappings within the file will be created and saved for those that are valid
• Mappings within the file that are not valid will not be saved, the index of the errounous mapping will be listed in the response with their errors.

[syphax-bouazzouni]

Deployed on

• testportal
• stageportal
• agroportal
• bioportal