ADD: Add commodity spot instrument class

Author: threecgreen

CHANGELOG.md

@@ -8,6 +8,9 @@
 - Added `Subscriptions()` getter methods to `LiveBlocking` and `LiveThreaded` for
   getting all active subscriptions
 
+### Breaking changes
+- Added `CommoditySpot` `InstrumentClass` variant
+
 ## 0.29.0 - 2025-02-04
 
 ### Enhancements

include/databento/enums.hpp

@@ -191,6 +191,7 @@ enum InstrumentClass : char {
   FutureSpread = 'S',
   OptionSpread = 'T',
   FxSpot = 'X',
+  CommoditySpot = 'Y',
 };
 }  // namespace instrument_class
 using instrument_class::InstrumentClass;

src/enums.cpp

@@ -392,6 +392,9 @@ const char* ToString(InstrumentClass instrument_class) {
     case instrument_class::FxSpot: {
       return "FxSpot";
     }
+    case instrument_class::CommoditySpot: {
+      return "CommoditySpot";
+    }
     default: {
       return "Unknown";
     }