Switch to dotnet8 for compilation and target framework (#28)

* Switch to dotnet 8 for compiling and as target framework

* Upgrade source to C#12

* Use nuget cache also for codeql

* Fix launch.json

* Publish artifacts in github validation build

* Remove explicit architecture from publish command

* Remove --no-restore from dotnet publish.

Upgrade libczicompressc to version 0.5.2 (#22)

* Upgrade libczicompressc to 0.5.2

* Adapt tests

* Use LFS for CZIs