Don't generate unnecessary extensions

[Dale King]

If you do not have any keys for global_secrets it still generates an unnecessary extension like:

public extension ArkanaKeys {
    struct Global: ArkanaKeysGlobalProtocol {
        public init() {}
    }
}

I presume like wise that if you had no environment_secrets It would also generate similar empty extensions.

You shouldn't generate these useless blocks of code if there are no keys

[Roger Oba]

Hi @dalewking ! 👋

Good observation! Thanks for pointing it out!