New pattern submission - API Gateway with Lambda Authorizer and Secrets Manager for API Key Authentication

[marcojahn]

To submit a template to the Serverless Patterns Collection, submit an issue with the following information.

Description:
This pattern demonstrates how to implement a secure API key-based authorization system using Amazon API Gateway, Lambda Authorizer, and AWS Secrets Manager. Each user/tenant has their own unique API key stored in Secrets Manager, which is validated by a Lambda authorizer when requests are made to protected API endpoints

GitHub PR for template:

#2690

[julianwood]

Thanks for the submissions. Added.