feat(GODT-2289): UIDValidity as Timestamp

Update UIDValidity to be timestamp with the number of seconds since
the 1st of February 2023. This avoids the problem where we lose the
last UIDValidity value due to the vault being missing/corrupted/deleted.

internal/bridge/bridge.go

@@ -30,6 +30,7 @@ import (
 	"github.com/Masterminds/semver/v3"
 	"github.com/ProtonMail/gluon"
 	imapEvents "github.com/ProtonMail/gluon/events"
+	"github.com/ProtonMail/gluon/imap"
 	"github.com/ProtonMail/gluon/reporter"
 	"github.com/ProtonMail/gluon/watcher"
 	"github.com/ProtonMail/go-proton-api"
@@ -122,6 +123,8 @@ type Bridge struct {
 
 	// goUpdate triggers a check/install of updates.
 	goUpdate func()
+
+	uidValidityGenerator imap.UIDValidityGenerator
 }
 
 // New creates a new bridge.
@@ -140,6 +143,7 @@ func New( //nolint:funlen
 	proxyCtl ProxyController, // the DoH controller
 	crashHandler async.PanicHandler,
 	reporter reporter.Reporter,
+	uidValidityGenerator imap.UIDValidityGenerator,
 
 	logIMAPClient, logIMAPServer bool, // whether to log IMAP client/server activity
 	logSMTP bool, // whether to log SMTP activity
@@ -169,6 +173,7 @@ func New( //nolint:funlen
 		api,
 		identifier,
 		proxyCtl,
+		uidValidityGenerator,
 		logIMAPClient, logIMAPServer, logSMTP,
 	)
 	if err != nil {
@@ -214,6 +219,7 @@ func newBridge(
 	api *proton.Manager,
 	identifier Identifier,
 	proxyCtl ProxyController,
+	uidValidityGenerator imap.UIDValidityGenerator,
 
 	logIMAPClient, logIMAPServer, logSMTP bool,
 ) (*Bridge, error) {
@@ -252,6 +258,7 @@ func newBridge(
 		logIMAPServer,
 		imapEventCh,
 		tasks,
+		uidValidityGenerator,
 	)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create IMAP server: %w", err)
@@ -298,6 +305,8 @@ func newBridge(
 		lastVersion: lastVersion,
 
 		tasks: tasks,
+
+		uidValidityGenerator: uidValidityGenerator,
 	}
 
 	bridge.smtpServer = newSMTPServer(bridge, tlsConfig, logSMTP)