Upgrade schedule for v1.9.0

[prozolic]

Description

CsToml v1.9.0 is scheduled to include new features from .NET 11.

New built-in support type

• System.Numerics.BFloat16
• System.Numerics.Decimal32 / System.Numerics.Decimal64 / System.Numerics.Decimal128
• System.Numerics.Complex<T>

Union type support

• CsToml.Generator supports union/IUnion/IUnionMember.
  Add union type support #123

How to use

It plans to add a new TomlUnionAttribute<T>.
Adding the above TomlUnionAttribute<T> will generate code for the Formatter class used for serialization/deserialization using CsToml.Generator.

[TomlUnion<int>]
public union SampleUnion(int, string);