api: Add missing GET teams endpoints (#5382)

* api: Add an endpoint to list a particular member of team.

* models: Rename `GetUserTeams()` to `GetUserOrgTeams()` in `org_team` model.

`GetUserTeams()` sounds a bit misnomer since it actually returns
the teams that user belongs to in a given organization rather than
all the teams across all the organization that the user has joined.

* models: Add `GetUserTeams()`.

Returns all the teams that a user belongs to.

* api: Add an endpoint for GET '/user/teams'.

A GET request to this endpoint lists all the teams that a user
belongs to.

vendor/code.gitea.io/sdk/gitea/release.go

@@ -53,7 +53,7 @@ func (c *Client) GetRelease(user, repo string, id int64) (*Release, error) {
 type CreateReleaseOption struct {
 	// required: true
 	TagName      string `json:"tag_name" binding:"Required"`
-	Target       string `json:"target_commitish"`
+	Target       string `json:"target_commitish" binding:"Required"`
 	Title        string `json:"name"`
 	Note         string `json:"body"`
 	IsDraft      bool   `json:"draft"`