Add issue's dependencies informations in issue API endpoint

[kvitrvn]

Feature Description

I think it will be great if the Gitea issue API response can send a list of its dependencies if they exists in addition to current informations.

The API issue response could be:

"_comment": "current informations ommit for brevity"
"repository": {
    "id": 1,
    "name": "test",
    "owner": "root",
    "full_name": "root/test"
},
"dependencies": [
    {
      "id": 1,
      "title": "ticket 1",
      "url": "http://localhost:3000/api/v1/repos/root/test/issues/1",
      "html_url": "http://localhost:3000/root/test/issues/1"
    }
]

I'm currently working on it to propose a PR if it's accepted 😃

Screenshots

No response