Providing a default implementation for IQuantity<TUnitType>.QuantityInfo (#1614)

- providing a default implementation for
`IQuantity<TUnitType>.QuantityInfo`
- removing the explicit implementations for `IQuantity` and
`IQuantity<TUnit>` (net8+)

Author: lipchev

CodeGen/Generators/UnitsNetGen/QuantityGenerator.cs

@@ -376,21 +376,21 @@ private void GenerateProperties()
 
         #region Explicit implementations
 
-        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        Enum IQuantity.Unit => Unit;
-
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
         UnitKey IQuantity.UnitKey => UnitKey.ForUnit(Unit);
 
+#if NETSTANDARD2_0
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        QuantityInfo IQuantity.QuantityInfo => Info;
+        IQuantityInstanceInfo<{_quantity.Name}> IQuantityOfType<{_quantity.Name}>.QuantityInfo => Info;
 
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
         QuantityInfo<{_unitEnumName}> IQuantity<{_unitEnumName}>.QuantityInfo => Info;
 
-#if NETSTANDARD2_0
         [DebuggerBrowsable(DebuggerBrowsableState.Never)]
-        IQuantityInstanceInfo<{_quantity.Name}> IQuantityOfType<{_quantity.Name}>.QuantityInfo => Info;
+        QuantityInfo IQuantity.QuantityInfo => Info;
+
+        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
+        Enum IQuantity.Unit => Unit;
 #endif
 ");
             if (_quantity.Logarithmic)