Add a basic web application tutorial using smithy

[haydenbaker]

Background

• This adds smithy-tutorial, a multi-component project that uses smithy for client and server generation
• The web application uses the generated client to make calls to a server implementation using the server-sdk
• This example uses typescript, both for client and server

Testing

• Pull locally
• Start the server: make dev-server
• Start the app: make dev-app

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By submitting this pull request, I confirm that my contribution is made under the terms of the MIT-0 license.