Add support on Swift Optional Type to perform a flatMap with a statically referenced instance method rather than returns a instance method references.

Optional+Ext.swift

extension Optional {
    
    func map(_ clojure: (Wrapped) -> () -> Wrapped) -> Wrapped? {
        guard let self = self else { return  nil }
        return clojure(self)()
    }
    
    func map<T>(_ keyPath: KeyPath<Wrapped, T>) -> T? {
        guard let self = self else { return  nil }
        return self[keyPath: keyPath]
    }
    
    func flatMap(_ clojure: (Wrapped) -> () -> Wrapped?) -> Wrapped? {
        guard let self = self else { return  nil }
        return clojure(self)()
    }
    
    func flatMap<T>(_ keyPath: KeyPath<Wrapped, T?>) -> T? {
        guard let self = self else { return  nil }
        return self[keyPath: keyPath]
    }
    
}