replace Activator.CreateInstance to Func for avoiding error in NativeAOT

[itn3000]

Overview

This fixes System.MissingMethodException when using XZ decompressor in NativeAOT.

Steps of reproduce

1. create new console project and set TargetFramework to net7.0
2. add SharpCompress package(this issue was investigated in 0.32.2)
3. edit cs to following reproducible code
4. publish with NativeAOT(and rid) option
5. create xz archive file
6. execute published executable file

Repro code

using SharpCompress.Compressors.Xz;

using(var istm = File.OpenRead("test.xz"))
using(var xstm = new XZStream(istm))
using(var ostm = File.Create("test.txt"))
{
    xstm.CopyTo(ostm);
}

Expected

"test.txt" is created and written decompressed result

Actual

System.MissingMethodException is thrown.

Unhandled Exception: System.MissingMethodException: No parameterless constructor defined for type 'SharpCompress.Compressors.Xz.Filters.Lzma2Filter'.
   at System.ActivatorImplementation.CreateInstance(Type, Boolean) + 0x208
   at System.Reflection.Runtime.General.ReflectionCoreCallbacksImplementation.ActivatorCreateInstance(Type, Boolean) + 0x2c
   at System.Activator.CreateInstance(Type, Boolean) + 0x48
   at System.Activator.CreateInstance(Type) + 0x20
   at SharpCompress.Compressors.Xz.Filters.BlockFilter.Read(BinaryReader) + 0x147
   at SharpCompress.Compressors.Xz.XZBlock.ReadFilters(BinaryReader, Int64) + 0x64
   at SharpCompress.Compressors.Xz.XZBlock.LoadHeader() + 0xdd
   at SharpCompress.Compressors.Xz.XZBlock.Read(Byte[], Int32, Int32) + 0x3f
   at SharpCompress.Compressors.Xz.XZStream.ReadBlocks(Byte[], Int32, Int32) + 0x89
   at SharpCompress.Compressors.Xz.XZStream.Read(Byte[], Int32, Int32) + 0x69
   at System.IO.Stream.CopyTo(Stream, Int32) + 0x155
   at System.IO.Stream.CopyTo(Stream) + 0x58
   at Program.<Main>$(String[]) + 0x82
   at xzcomptest!<BaseAddress>+0x2b9c57
   at xzcomptest!<BaseAddress>+0x2b9cea

Workaround

Currently, this can be avoided by adding class under SharpCompress.Compressors.Xz.Filters in rd.xml.
here is example of rd.xml

<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
    <Application>
        <Assembly Name="SharpCompress">
            <Type Name="SharpCompress.Compressors.Xz.Filters.Lzma2Filter" Dynamic="Required All"/>
        </Assembly>
    </Application>
</Directives>

[adamhathcock]

Thanks. Definitely getting SharpCompress doing NativeAOT is good