Add async support, update brotli core to v1.0.9

New features and changes in this release:

• Add async stream support, this improves the compatibility with asp.net core 3.1 and above applications
• Add the compression provider sample for asp.net core applications
• Upgrade brotli core to v1.0.9 with minor speed / memory usage improvements besides some CVE fix
• Add some usefully byte[]/stream extensions, so compress/decompress is more easier

Please note:
.NET Framework 3.5/4.0 are no longer supported since this release.

Improve compatibility for .NET Framework

Now besides .NET Standard2, also support .NET Framework v3.5 and above.

Add Mac OSX Support

Add support for Mac OSX(10.12+).
Now library works on Windows/Linux/OSX.

Add support for .net standard 2

Full code restructure, now supporting Linux and Windows.
Both of .NET Framework and .NET Core are supported.
Unit test has been updated to use xunit to support test on linux.

migrated to C++ CLR, add .net 2 support

Add support and .NET framework 2,migrate from P/Invoke to CLR so that assemblies can be updated/removed inside an IIS application.

fix stream dispose

v1.0.8

fix dispose issue