Switch submit-passport API to use lambda functions

[nutrina]

As the new load tests have revealed, scaling the service for the submit-passport request is difficult, because these requests take quite a long to to process.
Lambda functions however seem to be able to handle spikes in traffic better (see branch https://github.com/gitcoinco/passport-scorer/tree/1646_lambda ), hence we would like to implement this API endpoint to be served by a lambda function.

• create a lambda function to handle the submit-passport request
  • the lambda function preferably calls the same handler as the current API
  • rate limit is verified
  • authentication token is verified
• create tests for lambda function
  • make sure the lambda function is properly handling the expected load balancer events https://docs.aws.amazon.com/lambda/latest/dg/services-alb.html
• should be triggered on the requests to /registry/submit-passport and /registry/v2/submit-passport. (is possible specify a wildcard /registry/*/submit-passport)