Introduce .NET 6.0

[matilote]

Fixes | Closes | Resolves #2571

Changes:

Migrate codebase from .NET 5.0 to .NET 6.0.
Support M1 (Apple Silicon) machines with osx-arm64 runtime.

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Testing

Requires testing

• Yes
• No

Further comments (optional)

• Requires changes around the hosting model

The minimal hosting model:

• Significantly reduces the number of files and lines of code required to create an app. Only one file is needed with four lines of code.

• Unifies Startup.cs and Program.cs into a single Program.cs file.

• Uses top-level statements to minimize the code required for an app.

• Uses global using directives to eliminate or minimize the number of using statement lines required.

• I had to create a symlink to libsnappy to run the node, otherwise the dll was not being found

sudo ln -s /opt/homebrew/Cellar/snappy/1.1.9/lib/libsnappy.1.1.9.dylib /usr/local/lib/libsnappy.dylib

[LukaszRozmej]

@matilote @1swaraj can you update our github actions to support .net6? Next lets build some test package/docker and test on different environments.

[LukaszRozmej]

I don't think we need to change our hosting model at this point, it works fine. I will look into warnings.