ADD: Add VWAP stat type for ICE

Author: threecgreen

CHANGELOG.md

@@ -6,6 +6,11 @@
 - Changed default `upgrade_policy` to `Upgrade` so by default the primary record types
   can always be used
 
+##### Bug fixes
+- Added missing `StatType::Vwap` variant used in the ICE datasets
+- Added missing `ToString` and `operator<<` handling for `StatType::ClosePrice` and
+  `StatType::NetChange`
+
 ## 0.15.0 - 2024-01-16
 
 ### Breaking changes

include/databento/enums.hpp

@@ -254,6 +254,10 @@ enum StatType : std::uint16_t {
   // The change in price from the close price of the previous trading session to
   // the most recent trading session. `price` will be set.
   NetChange = 12,
+  /// The volume-weighted average price (VWAP) during the trading session.
+  /// `price` will be set to the VWAP while `quantity` will be the traded
+  /// volume.
+  Vwap = 13,
 };
 }  // namespace stat_type
 using stat_type::StatType;

src/enums.cpp

@@ -462,6 +462,15 @@ const char* ToString(StatType stat_type) {
     case StatType::FixingPrice: {
       return "FixingPrice";
     }
+    case StatType::ClosePrice: {
+      return "ClosePrice";
+    }
+    case StatType::NetChange: {
+      return "NetChange";
+    }
+    case StatType::Vwap: {
+      return "Vwap";
+    }
     default: {
       return "Unknown";
     }