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/client4.go

@@ -1078,6 +1078,26 @@ func (c *Client4) UpdateUserPassword(userId, currentPassword, newPassword string
 	return CheckStatusOK(r), BuildResponse(r)
 }
 
+// PromoteGuestToUser convert a guest into a regular user
+func (c *Client4) PromoteGuestToUser(guestId string) (bool, *Response) {
+	r, err := c.DoApiPost(c.GetUserRoute(guestId)+"/promote", "")
+	if err != nil {
+		return false, BuildErrorResponse(r, err)
+	}
+	defer closeBody(r)
+	return CheckStatusOK(r), BuildResponse(r)
+}
+
+// DemoteUserToGuest convert a regular user into a guest
+func (c *Client4) DemoteUserToGuest(guestId string) (bool, *Response) {
+	r, err := c.DoApiPost(c.GetUserRoute(guestId)+"/demote", "")
+	if err != nil {
+		return false, BuildErrorResponse(r, err)
+	}
+	defer closeBody(r)
+	return CheckStatusOK(r), BuildResponse(r)
+}
+
 // UpdateUserRoles updates a user's roles in the system. A user can have "system_user" and "system_admin" roles.
 func (c *Client4) UpdateUserRoles(userId, roles string) (bool, *Response) {
 	requestBody := map[string]string{"roles": roles}
@@ -1904,6 +1924,21 @@ func (c *Client4) InviteUsersToTeam(teamId string, userEmails []string) (bool, *
 	return CheckStatusOK(r), BuildResponse(r)
 }
 
+// InviteGuestsToTeam invite guest by email to some channels in a team.
+func (c *Client4) InviteGuestsToTeam(teamId string, userEmails []string, channels []string, message string) (bool, *Response) {
+	guestsInvite := GuestsInvite{
+		Emails:   userEmails,
+		Channels: channels,
+		Message:  message,
+	}
+	r, err := c.DoApiPost(c.GetTeamRoute(teamId)+"/invite-guests/email", guestsInvite.ToJson())
+	if err != nil {
+		return false, BuildErrorResponse(r, err)
+	}
+	defer closeBody(r)
+	return CheckStatusOK(r), BuildResponse(r)
+}
+
 // InvalidateEmailInvites will invalidate active email invitations that have not been accepted by the user.
 func (c *Client4) InvalidateEmailInvites() (bool, *Response) {
 	r, err := c.DoApiDelete(c.GetTeamsRoute() + "/invites/email")