Router / Extension - Add auth data to ensure only invoked lambdas are allowed to serve requests

[huntharo]

Motivations

• Some level of security is nice
• Prevents accidentally taking traffic if an extension connects to the wrong router (e.g. because of IP reuse and some sort of delay/hang/replayed request)

Acceptance Criteria

• Generate secure random data or signature
• Send data in the invoke
• Echo the data back in the connections
• Reject requests that do not have the data or have the wrong value