Fixes .ROBLOSECURITY= requirement when binding cookies

[antipoly]

This pull fixes the requirement of prefixing your cookies with a .ROBLOSECURITY string when context binding them into a function, as in such an example:

const cookie = ".ROBLOSECURITY=..."
const result = await OpenBlox.ClassicAPI.ClassicUsersApi.authenticatedUserInfo.bind({ cookie })();

This package comes with all of the return type signatures for each API request, but fails to export them for convenience. This would fix #20.

I added a bare minimum test suite to verify the changes I was making: /tests

I also added the .name property on HttpError.