feature request: add url to notes

[jaccoNCSCNL]

As a national CERT we often include (parts of) text from vendors in our generated CSAF documents. These texts are in the notes section of the vulnerability properties. In the references section we now have the link to the original advisory.
Currently it is not possible to connect the note to the reference. It would be nice to make that connection. This could be done either by a url field in the note, or via a construct similar to product_id i.e. a unique string per url which can be referenced in the notes section.

[tschmidtb51]

Thank you for the suggestion. The TC will discuss the suggestion.

[tschmidtb51]

As discussed in today's TC meeting, here is an example, how this could look like:

      "notes": [
        {
          "category": "summary",
          "references": "CSAFRef-0001",
          "text": "Summarizing the text that should be in here. BTW: It was actually cited or taken from the original advisory linked in the references.",
          "title": "Vulnerability summary"
        }
      ],
      // ...
      "references": [
        {
          "category": "external",
          "id": "CSAFRef-0001",
          "summary": "A cool summary",
          "url": "https://example.com/an-advisory-url-I-want-to-cite"
        }
      ],

[jaccoNCSCNL]

looks good. this will work for us.