driver: cache features

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

driver/manager.go

@@ -150,6 +150,8 @@ type cachedDriver struct {
 	client       *client.Client
 	err          error
 	once         sync.Once
+	featuresOnce sync.Once
+	features     map[Feature]bool
 }
 
 func (d *cachedDriver) Client(ctx context.Context) (*client.Client, error) {
@@ -158,3 +160,10 @@ func (d *cachedDriver) Client(ctx context.Context) (*client.Client, error) {
 	})
 	return d.client, d.err
 }
+
+func (d *cachedDriver) Features() map[Feature]bool {
+	d.featuresOnce.Do(func() {
+		d.features = d.Driver.Features()
+	})
+	return d.features
+}