Adopt Swift Concurrency adoption guidelines for Swift Server Libraries (swift-server/guides#70).
- Use #if compiler(>=5.5) && canImport(_Concurrency) to judge if Concurrency is available
- Some clean up
* 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
YR Chen
tomer doron