Restructure Java API

[mewim]

No description provided.

[codecov]

Codecov Report

Patch coverage: 82.15% and project coverage change: -0.17 ⚠️

Comparison is base (53fa452) 91.32% compared to head (12b06d8) 91.15%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1757      +/-   ##
==========================================
- Coverage   91.32%   91.15%   -0.17%     
==========================================
  Files         768      769       +1     
  Lines       27550    28089     +539     
==========================================
+ Hits        25160    25605     +445     
- Misses       2390     2484      +94     

Impacted Files	Coverage Δ
tools/java_api/src/jni/kuzu_java.cpp	82.15% <82.15%> (ø)

... and 2 files with indirect coverage changes

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