Branch: feature/NIP42_Issue_80

• Fix auth errors ["OK","274a1363221092f3b15de2a81ebe3b6e6473464c9ac064621443cabda05e97a1",false,"restricted: authentication error: Invalid AUTH message"] from relay ws://localhost:5555
• Implement CLOSED command.
• Test authentication after the CLOSED handler with auth-required: warning message