embed .so file in .jar file

[jenow]

What does this PR do ?

Embed the .so file inside the .jar file

How should this be manually tested?

cd internal/wrappers
make java
cd build/java/build/libs
jar xf kuzzlesdk-1.0.0.jar

Check if libkuzzle-wrapper-java.so is there

[codecov-io]

Codecov Report

Merging #175 into 1.x will decrease coverage by 1.88%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##              1.x   #175      +/-   ##
========================================
- Coverage   88.89%    87%   -1.89%     
========================================
  Files         244    244              
  Lines        4411   4533     +122     
========================================
+ Hits         3921   3944      +23     
- Misses        458    557      +99     
  Partials       32     32

Impacted Files	Coverage Δ
connection/websocket/web_socket.go	10.69% <0%> (+1.77%)	⬆️
realtime/join.go	78.37% <0%> (+5.4%)	⬆️
realtime/subscribe.go	77.14% <0%> (+5.71%)	⬆️

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