[FR] REST API v2.1.0 first iocs endpoints

[Elise17]

This issue is about the implementation of the first iocs endpoints.

• POST /api/v2/cases/{identifier}/iocs
• GET /api/v2/iocs/{identifier}
• DEL /api/v2/iocs/{identifier}

For each endpoint, the tasks are the following:

• document the new API in the openapi documentation
• implement automatic tests+code
• deprecate the previous endpoints
• replace the previous endpoints with the new ones in the web interface

This are the previous endpoints which will be deprecated by these:

In case_ioc_routes.py :

• url : /case/ioc/add (old url) => POST /api/v2/cases/{identifier}/iocs
• url : /case/ioc/{ioc_id} (old url) => GET /api/v2/iocs/{identifier}
• url : /case/ioc/state (old url) => GET /api/v2/iocs/{identifier}
• url : /case/ioc/delete/{ioc_id} (old url) => DEL api/v2/iocs/{identifier}

[Elise17]

It seems that the endpoints to be deprecated are used in the following files for the IHM:

• /case/ioc/delete/{ioc_id} and /case/ioc/add source/app/static/assets/js/iris/case.ioc.js