Wall Street has tapped former National Security Agency director Keith Alexander to form a council that would coordinate how banks and the government respond to cyber attacks, according to an internal industry proposal obtained by HuffPost. Alexander led the NSA when former contractor Edward Snowden revealed how the agency had conducted widespread surveillance on Americans. Since leaving the NSA in March, Alexander has started his own consulting firm, IronNet Cybersecurity Inc., reportedly charging between $600,000 and $1 million per month for his services. …