Add possibility to configure termsOfService in info object of OpenAPI document

[teezip]

For open APIs it would be needed to publish both open data license and terms of use like this in the info object of OpenAPI document:

"info": {
  "license" : {
      "name" : "Open data CC 4.0 licence.",
      "url" : "some url to opendata licence"
   },
   "termsOfService": "some url to terms of use for the open API service"
}

Currently termsOfService cannot be configured on Hakunapi. This support should be added at least in the conf parser and other places where Open API document is generated:

https://github.com/nlsfi/hakunapi/blob/main/src/hakunapi-core/src/main/java/fi/nls/hakunapi/core/config/HakunaConfigParser.java

[jampukka]

I'll add this, however it will only appear in the /api response. No real place for it in / landing page response schema.

[teezip]

Thanks, adding this to the /api response should be enough.