Parse namestyle configuration for const_variable_name_style

[AndreaWalchshoferSCCH]

I am currently working on another name style rule, during which I noticed that any custom configuration of const_variable_name_style is not applied due to this missing line.

This PR resolves that problem.

[CppCXY]

I noticed that you seem very interested in writing lints, but this library is not designed for that. It lacks many facilities, and due to design issues, debugging is very difficult. I suggest you consider re-implementing the naming style checks in my language server

[AndreaWalchshoferSCCH]

Thanks for merging!
And also thank you for pointing out your language server, I will definitely keep an eye on that from now on.

However, I'm using the LuaLS within a work project where it is currently established and started writing lints for the LuaLS project to cover missing requirements. For lints concerning name style, I was rightfully redirected to your EmmyLuaCodeStyle project so I continued implementing the appropriate lints/formatting options we were missing here.

I would still go forward with contributing that work-in-progress name style here. It is the last necessary change I know of right now so I got it covered within the current LuaLS versions. Because it seems that your language server is still in early stages.