Modify ranked_outliers distance search condition & Release 0.15.0

[sehkone]

• Change the distance search criteria to support a single search.
• Change the type of id in the Rankedoutlier field from StringNumber to ID.
• Change the part about RankedOutlierTotalCount to count the total count differently.
• Bump version to 0.15.0

Closes: #83, #87, #88

[sehkone]

@MW-Kim , @kimhanbeom , 커밋 메시지에 버전이 0.15.0가 아닌 0.14.6으로 적혀 있었습니다. 커밋 메시지에 약간의 오류가 있을 수는 있으나, 이런 오류는 큰 혼동을 줄 수 있으므로 수정합니다. 기존에 push한 0.15.0 tag는 제가 삭제하였습니다. 이 PR을 merge한 후에 다시 tag 붙여 주세요.

[codecov-commenter]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (b2ac87b) 48.37% compared to head (148d73c) 48.35%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/graphql/outlier.rs	0.00%	10 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
- Coverage   48.37%   48.35%   -0.02%     
==========================================
  Files          62       62              
  Lines       10104    10108       +4     
==========================================
  Hits         4888     4888              
- Misses       5216     5220       +4     

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