feat: Add notice for possible iavl fast node migration (backport cosm…

…os#13390) (cosmos#13398)

* add notice for possible iavl fast node migration (cosmos#13390)

(cherry picked from commit b609105)

* Update baseapp/baseapp.go

Co-authored-by: adu-crypto <94821467+adu-crypto@users.noreply.github.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

baseapp/baseapp.go

@@ -289,6 +289,7 @@ func (app *BaseApp) SnapshotManager() *snapshots.Manager {
 // LoadVersion loads the BaseApp application version. It will panic if called
 // more than once on a running baseapp.
 func (app *BaseApp) LoadVersion(version int64) error {
+	app.logger.Info("NOTICE: this could take a long time to migrate IAVL store to fastnode if you enable Fast Node.\n")
 	err := app.cms.LoadVersion(version)
 	if err != nil {
 		return fmt.Errorf("failed to load version %d: %w", version, err)