[host] add RefreshBootTimeCache function

This commit adds the RefreshBootTimeCache function, allowing users to
manually refresh the cached boot time if they are using the
`enableBootTimeCache` feature.

host/host.go

@@ -69,6 +69,12 @@ func EnableBootTimeCache(enable bool) {
 	enableBootTimeCache = enable
 }
 
+// RefreshBootTimeCache manually refreshes the cached BootTime value.
+func RefreshBootTimeCache(ctx context.Context) error {
+	_, err := common.BootTimeWithContext(ctx, false)
+	return err
+}
+
 func Info() (*InfoStat, error) {
 	return InfoWithContext(context.Background())
 }