Change the type of the InboundEmail.Charsets property

[Jericho]

Currently, the type of this property is KeyValuePair<string, Encoding>[] but the Encoding type is problematic. The main problem is that this type contains a ReadOnly<Span> property which the Json source generator cannot handle. This is not so bad in .NET 6 and prior frameworks because we can omit the InboundEmail class from the serialization context and let the Json serializer/deserializer fall back to reflection based serialization.

However, this fallback logic has been removed in .NET7 which means that we have to include InboundEmail in the serialization context. Therefore, the only solution is to remove the Encoding type and replace it with a simple string.

[Jericho]

🎉 This issue has been resolved in version 0.94.0 🎉

The release is available on:

• GitHub Release
• NuGet Package

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