Provide MITRE descriptions by assistent description for report

[de-jcup]

Situation

After

• Introduce the “Assistant” domain + provide a simple support for vulnerability descriptions #3708

the assistant domain will only provide manual entries for CWE ids and languages.

Wanted

We want SecHub to provide automatically MITRE information via the assistant describe endpoints.
The information shall be automatically fetched when assistant descriptions are wanted for a report.

Solution

• Introduce database table inside assistant domain which holds MITRE information
• GET call for describe fetches MITRE data from cache (db) or - if not already in cache - loads data from MITRE and stores in cache
• The cache has an optional valid-until timestamp. When cache entry is outdated, the entry shall be refreshed if possible
• Write concept documentation for MITRE data fetching and caching
• Write integration test (but with mocked mitre service)
• Write wire mock test (to simulate mitre website results)