keep track of contract coverage

[CodeOfRob]

This issue keeps track of which contract objects are currently parsed at which level of detail

[CodeOfRob]

legend:

✅ all properties covered and tested
🚧 some properties covered and tested
❌ not covered at all

Objects to cover:

✅ OpenAPI Object (Contract)
✅ Info Object
✅ Contact Object
✅ License Object
✅ Server Object
✅ Server Variable Object
✅ Components Object
✅ Paths Object
✅ Path Item Object
✅ Operation Object
✅ External Documentation Object
✅ Parameter Object
✅ Request Body Object (PR)
✅ Media Type Object
✅ Encoding Object
✅ Responses Object
✅ Response Object
✅ Callback Object (PR)
✅ Link Object (PR)
✅ Header Object
✅ Tag Object
✅ Reference Object
✅ Schema Object
✅ Discriminator Object

Objects out of scope:

🚧 Example Object
❌ XML Object
🚧 Security Scheme Object
❌ OAuth Flows Object
❌ OAuth Flow Object
🚧 Security Requirement Object