[INFRA] Lambda function setup

[nutrina]

We need a lambda function to handle the submit-passport requests:

• lambda function should be linked to the current load balancer
• should be triggered on the requests to /registry/submit-passport and /registry/v2/submit-passport. (is possible specify a wildcard /registry/*/submit-passport)
• should be throttled - topic for discussion
• lambda function will be implemented in Python and deployed as a container (this is open for discussion if other deployment type would be recommended)

So far the approach with lambda function has been tested here: https://github.com/gitcoinco/passport-scorer/tree/1646_lambda

[nutrina]

The throttling of the acces to lambda will happen from the WAF.
All other points are covered in the test branch: https://github.com/gitcoinco/passport-scorer/tree/1646_lambda