Improve performance for Lack of Cohesion metric

[mcserep]

Refactor 3 level nested query loop to 2 level.

[Copilot]

Pull Request Overview

This PR refactors the lackOfCohesion metric calculation to reduce a three-level database query loop into a two-level in-memory filtering, improving overall performance.

• Combine per-method AST node queries into one batched query.
• Collect methods first, build a single nodeQuery via OR clauses, fetch all nodes, then filter in memory.
• Extend CohesionCppAstNodeView with start/end positions and filePath fields to support the new query.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
plugins/cpp_metrics/parser/src/cppmetricsparser.cpp	Refactored nested queries into a combined query + in-memory filtering
plugins/cpp_metrics/model/include/model/cppcohesionmetrics.h	Added AST node position and filePath columns to support filtering

Comments suppressed due to low confidence (1)

plugins/cpp_metrics/parser/src/cppmetricsparser.cpp:315

• Add or update tests to verify that the refactored two-level loop produces the same cohesion metrics as the previous implementation.

          // Record these fields for later use.