Exception when serialize `List<string>` at aot mode.

[dameng324]

Hi, I run into some issue when using MemoryPack in my project:

Full repro code is here:

var list =new List<string>(){"123","456"};
var bytes = MemoryPack.MemoryPackSerializer.Serialize(list);

when publish aot and run:

dotnet publish && ./bin/Release/net9.0/win-x64/publish/TestAot.exe

It run into error:

Unhandled exception. MemoryPack.MemoryPackSerializationException: System.Collections.Generic.List`1[[System.String, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]] is failed in provider at creating formatter.
 ---> System.NotSupportedException: 'MemoryPack.Formatters.ListFormatter`1[System.String]' is missing native code or metadata. This can happen for code that is not compatible with trimming or AOT. Inspect and fix trimming and AOT related warnings that were generated when the app was published. For more information see https://aka.ms/nativeaot-compatibility
   at System.Reflection.Runtime.General.TypeUnifier.WithVerifiedTypeHandle(RuntimeConstructedGenericTypeInfo, RuntimeTypeInfo[]) + 0x7e
   at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.MakeGenericType(Type[]) + 0x207
   at MemoryPack.MemoryPackFormatterProvider.TryCreateGenericFormatterType(Type, IDictionary`2) + 0x71
   at MemoryPack.MemoryPackFormatterProvider.CreateGenericFormatter(Type, Boolean) + 0x11e
   at MemoryPack.MemoryPackFormatterProvider.Cache`1..cctor() + 0x6d
   --- End of inner exception stack trace ---
   at MemoryPack.MemoryPackSerializationException.ThrowRegisterInProviderFailed(Type, Exception) + 0x4a
   at MemoryPack.ErrorMemoryPackFormatter`1.Throw() + 0x58
   at MemoryPack.MemoryPackWriter`1.WriteValue[T](T&) + 0x53
   at MemoryPack.MemoryPackSerializer.Serialize[T](T&, MemoryPackSerializerOptions) + 0x342
   at Program.<Main>$(String[] args) + 0x89

Is this expected? Is there any workaround?