cpu and memory optimization

[yuzawa-san]

• use a arena SegmentAllocator to avoid hitting malloc too often
• presize builder input outputs
• hoist OrtValue release to TransactionImpl

[codecov-commenter]

Codecov Report

Merging #67 (d81b8a5) into master (40e14ef) will decrease coverage by 0.57%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #67      +/-   ##
============================================
- Coverage     80.88%   80.30%   -0.58%     
+ Complexity      311      299      -12     
============================================
  Files            39       39              
  Lines          1135     1102      -33     
  Branches         69       70       +1     
============================================
- Hits            918      885      -33     
  Misses          189      189              
  Partials         28       28              

Impacted Files	Coverage Δ
src/main/java/com/jyuzawa/onnxruntime/ApiImpl.java	100.00% <ø> (ø)
...n/java/com/jyuzawa/onnxruntime/OnnxOpaqueImpl.java	0.00% <ø> (ø)
...java/com/jyuzawa/onnxruntime/OnnxOptionalImpl.java	0.00% <ø> (ø)
.../com/jyuzawa/onnxruntime/OnnxTensorStringImpl.java	81.08% <ø> (-2.64%)	⬇️
...in/java/com/jyuzawa/onnxruntime/OnnxValueImpl.java	76.92% <ø> (ø)
...n/java/com/jyuzawa/onnxruntime/TensorInfoImpl.java	100.00% <ø> (ø)
...main/java/com/jyuzawa/onnxruntime/OnnxMapImpl.java	82.81% <100.00%> (-1.91%)	⬇️
...java/com/jyuzawa/onnxruntime/OnnxSequenceImpl.java	71.69% <100.00%> (-3.31%)	⬇️
.../com/jyuzawa/onnxruntime/OnnxTensorBufferImpl.java	100.00% <100.00%> (ø)
...om/jyuzawa/onnxruntime/TransactionBuilderImpl.java	97.91% <100.00%> (-0.05%)	⬇️
... and 1 more

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