Add customizable logging system #77
Merged
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Introduced a custom logging system that still defaults to stdout, but is easy for any dev to override and customize.
Given that there a half dozen "standard" packages for logging in Java with mixed interoperability, I didn't want to create a dependency for one of them in the SDK. Instead I added a simple interface that users can implement in order to redirect the SDKs log output to their own internal logging system such as Java Logging, log4j2, SLF4J, etc
This mimics a similar system we provide in the Go SDK