Overview

This patch version brings several improvements to the resource handling in the commands and some additional usability features.

Introduced additional return types for the SPARQL based RDF export. Previously the result was returned only as String. There are cases, where the produced RDF is quite large and if there is no enough memory to for buffering, the command throws OOM exception, while consuming the stream. With the additional types the users can avoid that problem by writing the stream in the file or directly consuming it from the response object.
The return types are also applied for the default command for RDF export, which uses the mapping JSON from the generated from the Mapping UI.
The users can control the return type by providing different ResultType to the ResultFormat#as(ResultType). The default is STRING to keep the library compatible and to ease the migration effort.

All stream IO operations are now done in UTF-8. There are some utility libraries that have different default charset. To keep the library consistent and the behavior predictable, we explicitly set the charset to UTF-8.
All third party and utility libraries are not updated to the latest version. There were issues with the artifact deployment so in order to solve it some of the libraries had to be updated, but in the process we ended up updating all.
Updated the versions of the actions used in the CI and Release processes.

There were places, where some of the streams were not closed properly, which may cause memory leaks in specific cases. To ensure that the resources are handled correctly, we've updated the logic to explicitly close all of the streams that we touch.

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