Prefixing code-generated actor's Kind property with proto package

[elnur-m]

Description

I've prefixed code-generated actor's Kind property with the .proto file's package name. The purpose behind this is to be able to create grains with the same name in different C# namespaces. One example would be creating an Account grain in App.Security namespace and another Account grain in App.Finance namespace.

Purpose

This pull request is a:

• 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)

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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[rogeralsing]

IMO we should use protobuf package name rather than .net namespace for this for future compatibility with Go cluster.