refactor: moving some stuff

types/volume.v

@@ -0,0 +1,22 @@
+module types
+
+import time
+
+pub struct UsageData {
+	size      int [json: Size]
+	ref_count int [json: RefCount]
+}
+
+pub struct Volume {
+pub mut:
+	created_at_str string            [json: CreatedAt]
+	created_at     time.Time         [skip]
+	name           string            [json: Name]
+	driver         string            [json: Driver]
+	mountpoint     string            [json: Mountpoint]
+	status         map[string]string [json: Status]
+	labels         map[string]string [json: Labels]
+	scope          string            [json: Scope]
+	options        map[string]string [json: Options]
+	usage_data     UsageData         [json: UsageData]
+}