Plugin groups (#30320)

* add new pluginapi methods

* SAML login hook

* set ReAddRemovedMembers to true for plugin groups

* change to DoLogin signature for SAML

server/public/plugin/interface_generator/main.go

@@ -307,6 +307,15 @@ var hooksTemplate = `// Copyright (c) 2015-present Mattermost, Inc. All Rights R
 
 package plugin
 
+import (
+	"fmt"
+	"log"
+
+	saml2 "github.com/mattermost/gosaml2"
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/shared/mlog"
+)
+
 {{range .HooksMethods}}
 
 func init() {
@@ -432,6 +441,7 @@ import (
 	"net/http"
 	timePkg "time"
 
+	saml2 "github.com/mattermost/gosaml2"
 	"github.com/mattermost/mattermost/server/public/model"
 )