[API] Issues are missing `HTMLURL`, `IssueURL`, and `PRURL`

[rymai]

• Gitea version (or commit ref):

  gitea/models/issue_comment.go

  Lines 127 to 135 in 8aeeed0

  	func (c *Comment) APIFormat() *api.Comment {
  	return &api.Comment{
  	ID: c.ID,
  	Poster: c.Poster.APIFormat(),
  	Body: c.Content,
  	Created: c.Created,
  	Updated: c.Updated,
  	}
  	}

Description

As of 8aeeed0, the Issue model doesn't expose HTMLURL, IssueURL, and PRURL in the ApiFormat function:

gitea/models/issue_comment.go

Lines 127 to 135 in 8aeeed0

	func (c *Comment) APIFormat() *api.Comment {
	return &api.Comment{
	ID: c.ID,
	Poster: c.Poster.APIFormat(),
	Body: c.Content,
	Created: c.Created,
	Updated: c.Updated,
	}
	}

but the Go SDK already expect those fields: https://github.com/go-gitea/go-sdk/blob/master/gitea/issue_comment.go#L15-L24

gogs/gogs#3624 has been submitted on Gogs but should be submitted on Gitea now.

Thanks in advance, it will help us having a more useful Gitea importer for GitLab (https://gitlab.com/gitlab-org/gitlab-ce/issues/22348).

/cc @bkcsoft