feat: Add proof of liquidity bucket contract

[AntonAndell]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 69.69697% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 76.01%. Comparing base (adc1c0c) to head (683868e).

Files	Patch %	Lines
...ava/icon/inflation/score/pol/ProofOfLiquidity.java	70.76%	18 Missing and 1 partial ⚠️
...src/main/java/icon/inflation/score/pol/Errors.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #14      +/-   ##
============================================
- Coverage     78.04%   76.01%   -2.04%     
- Complexity       42       53      +11     
============================================
  Files             6        8       +2     
  Lines           205      271      +66     
  Branches         15       21       +6     
============================================
+ Hits            160      206      +46     
- Misses           39       58      +19     
- Partials          6        7       +1     

Flag	Coverage Δ
java	76.01% <69.69%> (-2.04%)	⬇️

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