AWS2 has 2 HTTP clients in "runtime" scope

[andrus]

software.amazon.awssdk:s3 depends on two HTTP clients at once - software.amazon.awssdk:apache-client and software.amazon.awssdk:netty-nio-client. Both are defined in the "runtime" scope by Amazon, and this is rather confusing (e.g. see aws/aws-sdk-java-v2#3040 ). By default the user will get an exception due to the missing client:

software.amazon.awssdk.core.exception.SdkClientException: Unable to load an HTTP implementation 
from any provider in the chain. You must declare a dependency on an appropriate HTTP implementation 
or pass in an SdkHttpClient explicitly to the client builder

And if the "runtime" scope is added to classpath, the user will end up with both clients on classpath (also not ideal, but seems to be required as the Apache is used for sync and Netty - for async (see #20, this is not implemented as of this writing))

We need to do something about this on the long term. Short term I suppose we need an explicit client modules ("bootique-aws2-client-apache", "bootique-aws2-client-netty") or something.