Notable changes

Added

• Add TypeScript "nkruntime.Error" custom error type that supports a custom message and grpc status code which can be returned in server responses.
• Add function to retrieve a random set of users to server framework.
• Add ChannelMessageSend function to server framework.
• Add BuildChannelId function to server framework.

Fixed

• Fix TypeScript "nkruntime.Context" value types.
• Add missing groupId argument from groupUpdate TypeScript definition.