MM-45120: Track team join times. Add API to retrieve new team members since a given time. (#20708)

* MM-45120: Starts tracking team join time. Adds API to retrieve team members who joined after a given time.

* MM-45120: Updates json casing to match model.User.

model/client4.go

@@ -8354,3 +8354,17 @@ func (c *Client4) GetIntegrationsUsage() (*IntegrationsUsage, *Response, error)
 	err = json.NewDecoder(r.Body).Decode(&usage)
 	return usage, BuildResponse(r), err
 }
+
+func (c *Client4) GetNewTeamMembersSince(teamID string, timeRange string, page int, perPage int) (*NewTeamMembersList, *Response, error) {
+	query := fmt.Sprintf("?time_range=%v&page=%v&per_page=%v", timeRange, page, perPage)
+	r, err := c.DoAPIGet(c.teamRoute(teamID)+"/top/team_members"+query, "")
+	if err != nil {
+		return nil, BuildResponse(r), err
+	}
+	defer closeBody(r)
+	var newTeamMembersList *NewTeamMembersList
+	if jsonErr := json.NewDecoder(r.Body).Decode(&newTeamMembersList); jsonErr != nil {
+		return nil, nil, NewAppError("GetNewTeamMembersSince", "api.unmarshal_error", nil, jsonErr.Error(), http.StatusInternalServerError)
+	}
+	return newTeamMembersList, BuildResponse(r), nil
+}