Config: Refactor version packages (#1887)

* Config: Move config versions to separate pacakges

* Config: Move version tests to blackbox texts

* Config: Protect registerVersion from overflow

* Config: Protect against version already registered

config/versions/v3/v3.go

@@ -0,0 +1,35 @@
+package v3
+
+import (
+	"context"
+	"time"
+
+	"github.com/buger/jsonparser"
+	"github.com/thrasher-corp/gocryptotrader/encoding/json"
+)
+
+// Version is an ExchangeVersion to remove the publishPeriod from the exchange's orderbook config
+type Version struct{}
+
+// Exchanges returns all exchanges: "*"
+func (*Version) Exchanges() []string { return []string{"*"} }
+
+// UpgradeExchange will remove the publishPeriod from the exchange's orderbook config
+func (*Version) UpgradeExchange(_ context.Context, e []byte) ([]byte, error) {
+	e = jsonparser.Delete(e, "orderbook", "publishPeriod")
+	return e, nil
+}
+
+const defaultOrderbookPublishPeriod = time.Second * 10
+
+// DowngradeExchange will downgrade the exchange's config by setting the default orderbook publish period
+func (*Version) DowngradeExchange(_ context.Context, e []byte) ([]byte, error) {
+	if _, _, _, err := jsonparser.Get(e, "orderbook"); err != nil {
+		return e, nil //nolint:nilerr // No error, just return the original config
+	}
+	out, err := json.Marshal(defaultOrderbookPublishPeriod)
+	if err != nil {
+		return e, err
+	}
+	return jsonparser.Set(e, out, "orderbook", "publishPeriod")
+}