Native AOT fully compatibility

[hadashiA]

Building with Native AOT actually works for the most part.
However, it seems that warnings occur because the compiler does not guarantee the operation.

/Users/s24061/dev/MemoryPack/src/MemoryPack.Core/bin/Release/net8.0/MemoryPack.Core.dll : warning IL2104: Assembly 'MemoryPack.Core' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries [/Users/s24061/dev/MemoryPack/sandbox/SandboxConsoleApp/SandboxConsoleApp.csproj]
/Users/s24061/dev/MemoryPack/src/MemoryPack.Core/bin/Release/net8.0/MemoryPack.Core.dll : warning IL3053: Assembly 'MemoryPack.Core' produced AOT analysis warnings. [/Users/s24061/dev/MemoryPack/sandbox/SandboxConsoleApp/SandboxConsoleApp.csproj]

If we add <IsAotCompatible>true</IsAotCompatible> to MemoryPack.Core.csproj, will see many warnings of the following types:

• IL2072
• IL2090
• IL2091
• IL3050

To fix this, it may be necessary to change to a mechanism that does not use reflection.

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