Guest accounts feature (#11428)

* MM-14139: Creating permissions for invite/promote/demote guests (#10778)

* MM-14139: Creating permissions for invite/promote/demote guests

* Fixing tests

* Adding invite guest api endpoint (#10792)

* Adding invite guest api endpoint

* Adding i18n

* Adding some tests

* WIP

* Migrating Token.Extra info to bigger size (2048)

* Fixing tests

* Adding client function for invite guests

* Adding send guests invites tests

* Renaming file from guest to guest_invite

* Adding Promote/Demote users from/to guest endpoints (#10791)

* Adding Promote/Demote users from/to guest endpoints

* Adding i18n translations

* Adding the client functions

* Using getQueryBuilder function

* Addressing PR review comments

* Adding default channels to users on promte from guest (#10851)

* Adding default channels to users on promte from guest

* Addressing PR review comments

* Fixing merge problems

* Sending websockets events on promote/demote (#11403)

* Sending websockets events on promote/demote

* Fixing merge problems

* Fixing govet shadowing problem

* Fixing feature branch tests

* Avoiding leaking users data through websockets for guest accounts (#11489)

* Avoiding leaking users data through websockets for guest accounts

* Adding tests and fixing code error

* Fixing i18n

* Allow to enable/disable guests and other extra config settings (#11481)

* Allow to enable/disable guests and other extra config settings

* Fixing tests and moving license and config validation to api level

* Update api4/role_test.go

Co-Authored-By: George Goldberg <george@gberg.me>

* Update api4/role_test.go

Co-Authored-By: George Goldberg <george@gberg.me>

* Fixing typo

* fixing tests

* Managing correctly the guest channel leave behavior (#11578)

* MM-15134: Removing guests from teams or system on leave channels if needed

* WIP

* No deactivating the guest user when leave the last team

* Adding a couple of tests

* Fixing shadow variables

* Fixing tests

* fixing tests

* fixing shadow variables

* Adding guest counts for channel stats (#11646)

* Adding guest counts for channel stats

* Adding tests

* Fixing tests

* Fixing guest domain restrictions (#11660)

* Adding needed migration for the database

* Fixing migration

model/config.go

@@ -2312,6 +2312,31 @@ func (s *DisplaySettings) SetDefaults() {
 	}
 }
 
+type GuestAccountsSettings struct {
+	Enable                           *bool
+	AllowEmailAccounts               *bool
+	EnforceMultifactorAuthentication *bool
+	RestrictCreationToDomains        *string
+}
+
+func (s *GuestAccountsSettings) SetDefaults() {
+	if s.Enable == nil {
+		s.Enable = NewBool(false)
+	}
+
+	if s.AllowEmailAccounts == nil {
+		s.AllowEmailAccounts = NewBool(true)
+	}
+
+	if s.EnforceMultifactorAuthentication == nil {
+		s.EnforceMultifactorAuthentication = NewBool(false)
+	}
+
+	if s.RestrictCreationToDomains == nil {
+		s.RestrictCreationToDomains = NewString("")
+	}
+}
+
 type ImageProxySettings struct {
 	Enable                  *bool
 	ImageProxyType          *string
@@ -2388,6 +2413,7 @@ type Config struct {
 	JobSettings             JobSettings
 	PluginSettings          PluginSettings
 	DisplaySettings         DisplaySettings
+	GuestAccountsSettings   GuestAccountsSettings
 	ImageProxySettings      ImageProxySettings
 }
 
@@ -2471,6 +2497,7 @@ func (o *Config) SetDefaults() {
 	o.JobSettings.SetDefaults()
 	o.MessageExportSettings.SetDefaults()
 	o.DisplaySettings.SetDefaults()
+	o.GuestAccountsSettings.SetDefaults()
 	o.ImageProxySettings.SetDefaults(o.ServiceSettings)
 }