Since we already required Swift 5.5 for Concurrency (Xcode 13), it's natural to update the demo app to reflect latest SwiftUI changes, which makes the code neater and more expressive.
* take advantage of @main where possible
* move the top level Sample code to the examples subdirectory
* extract a few examples form the "LambdaFunctions" directory (which is really a deployment demo) and move them to the top level Examples directory
* rename "LambdaFunctions" examples as "Deployments" to make their intent clearer
* add a sample that demonstrates how to test a lambda now that SwiftPM can test executables directly
* update the test-sample docker setup to build & test th new samples
* fix a few typos and In/Out typealias left overs
* remove LinuxMain since its no longer required
motivation: clearer examples as we prepare to open source
changes:
* rename debugging example to make the name more accurate
* add more information in the local debugging example
* add a Shared module to show how to share code between client and server
* make example more useful - use JSON for registration like flow
* add docker-compose task to test examples
Co-authored-by: Yim Lee <yim_lee@apple.com>