Ability to run lambda functions locally

[HeyJoel]

Currently it's not possible to run the lambda project locally e.g. from Visuao Studio, the closest we have is running the tests in the VehicleTaxonomy.Aws.Api.Tests project. While the tests are fine, it doesn't help us test serialization and gateway bindings from a properly invoked function. Options:

• Use sam local: Currently when running the SAM local test environment the DynamoDb instance is not accessible from the lambdas in the same way it is in production. There seems to be some workarounds for this issue, here's one.
• Investigate using the Lambda Test Tool as mentioned in this article.