move builders into inner classes + register a shared allocator

[yuzawa-san]

No description provided.

[codecov-commenter]

Codecov Report

Merging #72 (763615b) into master (9b03e58) will increase coverage by 0.14%.
The diff coverage is 91.15%.

@@             Coverage Diff              @@
##             master      #72      +/-   ##
============================================
+ Coverage     80.91%   81.05%   +0.14%     
+ Complexity      338      295      -43     
============================================
  Files            49       46       -3     
  Lines          1294     1309      +15     
  Branches         78       80       +2     
============================================
+ Hits           1047     1061      +14     
- Misses          211      212       +1     
  Partials         36       36              

Impacted Files	Coverage Δ
...main/java/com/jyuzawa/onnxruntime/ManagedImpl.java	85.71% <75.00%> (-1.79%)	⬇️
...main/java/com/jyuzawa/onnxruntime/SessionImpl.java	82.88% <81.21%> (-14.84%)	⬇️
.../java/com/jyuzawa/onnxruntime/EnvironmentImpl.java	84.61% <90.16%> (+41.75%)	⬆️
.../java/com/jyuzawa/onnxruntime/TransactionImpl.java	98.88% <98.00%> (-1.12%)	⬇️
src/main/java/com/jyuzawa/onnxruntime/ApiImpl.java	97.57% <100.00%> (+0.13%)	⬆️
...ava/com/jyuzawa/onnxruntime/ModelMetadataImpl.java	97.95% <100.00%> (-0.05%)	⬇️

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