subscriptions: Add templating support and integrate with Binance (#1568)

* Subscriptions: Add List.AssetPairs

* Subscriptions: Add Template and QualifiedChannel

These fields separate the concept of what the channel is from the
qualified resource name

* Subscriptions: Add List.SetStates()

* Subscriptions: Add List.QualifiedChannels

* Subscriptions: Rename testsubs.EqualLists

* Binance: Switch to ExpandTemplates

* Binance: Update ConfigTest format

* Subscriptions: Test Coverage improvements

* Subscriptions: Reenterant List.ExpandTemplates

* Subscriptions: Move templates from subscriptions to exchanges

* Binance: Inline subscription template and improvements

exchanges/subscription/subscription.go

@@ -47,17 +47,18 @@ type State uint8
 
 // Subscription container for streaming subscriptions
 type Subscription struct {
-	Enabled       bool           `json:"enabled"`
-	Key           any            `json:"-"`
-	Channel       string         `json:"channel,omitempty"`
-	Pairs         currency.Pairs `json:"pairs,omitempty"`
-	Asset         asset.Item     `json:"asset,omitempty"`
-	Params        map[string]any `json:"params,omitempty"`
-	Interval      kline.Interval `json:"interval,omitempty"`
-	Levels        int            `json:"levels,omitempty"`
-	Authenticated bool           `json:"authenticated,omitempty"`
-	state         State
-	m             sync.RWMutex
+	Enabled          bool           `json:"enabled"`
+	Key              any            `json:"-"`
+	Channel          string         `json:"channel,omitempty"`
+	Pairs            currency.Pairs `json:"pairs,omitempty"`
+	Asset            asset.Item     `json:"asset,omitempty"`
+	Params           map[string]any `json:"params,omitempty"`
+	Interval         kline.Interval `json:"interval,omitempty"`
+	Levels           int            `json:"levels,omitempty"`
+	Authenticated    bool           `json:"authenticated,omitempty"`
+	QualifiedChannel string         `json:"-"`
+	state            State
+	m                sync.RWMutex
 }
 
 // String implements Stringer, and aims to informatively and uniquely identify a subscription for errors and information
@@ -122,20 +123,22 @@ func (s *Subscription) EnsureKeyed() any {
 
 // Clone returns a copy of a subscription
 // Key is set to nil, because most Key types contain a pointer to the subscription, and because the clone isn't added to the store yet
+// QualifiedChannel is not copied because it's expected that the contributing fields will be changed
 // Users should allow a default key to be assigned on AddSubscription or can SetKey as necessary
 func (s *Subscription) Clone() *Subscription {
 	s.m.RLock()
 	c := &Subscription{
-		Key:           nil,
-		Enabled:       s.Enabled,
-		Channel:       s.Channel,
-		Asset:         s.Asset,
-		Params:        s.Params,
-		Interval:      s.Interval,
-		Levels:        s.Levels,
-		Authenticated: s.Authenticated,
-		state:         s.state,
-		Pairs:         s.Pairs,
+		Key:              nil,
+		Enabled:          s.Enabled,
+		Channel:          s.Channel,
+		Asset:            s.Asset,
+		Params:           s.Params,
+		Interval:         s.Interval,
+		Levels:           s.Levels,
+		Authenticated:    s.Authenticated,
+		state:            s.state,
+		Pairs:            s.Pairs,
+		QualifiedChannel: s.QualifiedChannel,
 	}
 	s.Pairs = slices.Clone(s.Pairs)
 	s.Params = maps.Clone(s.Params)