Make gitea webhooks openproject compatible (gitea#28435)

This PR adds some fields to the gitea webhook payload that
[openproject](https://www.openproject.org/) expects to exists in order
to process the webhooks.
These fields do exists in Github's webhook payload so adding them makes
Gitea's native webhook more compatible towards Github's.

modules/structs/issue.go

@@ -30,6 +30,7 @@ type PullRequestMeta struct {
 	HasMerged        bool       `json:"merged"`
 	Merged           *time.Time `json:"merged_at"`
 	IsWorkInProgress bool       `json:"draft"`
+	HTMLURL          string     `json:"html_url"`
 }
 
 // RepositoryMeta basic repository information

modules/structs/pull.go

@@ -21,8 +21,14 @@ type PullRequest struct {
 	Assignees          []*User    `json:"assignees"`
 	RequestedReviewers []*User    `json:"requested_reviewers"`
 	State              StateType  `json:"state"`
+	Draft              bool       `json:"draft"`
 	IsLocked           bool       `json:"is_locked"`
 	Comments           int        `json:"comments"`
+	// number of review comments made on the diff of a PR review (not including comments on commits or issues in a PR)
+	ReviewComments int `json:"review_comments"`
+	Additions      int `json:"additions"`
+	Deletions      int `json:"deletions"`
+	ChangedFiles   int `json:"changed_files"`
 
 	HTMLURL  string `json:"html_url"`
 	DiffURL  string `json:"diff_url"`

modules/structs/user.go

@@ -27,6 +27,8 @@ type User struct {
 	Email string `json:"email"`
 	// URL to the user's avatar
 	AvatarURL string `json:"avatar_url"`
+	// URL to the user's gitea page
+	HTMLURL string `json:"html_url"`
 	// User locale
 	Language string `json:"language"`
 	// Is the user an administrator