Add support for collecting coverage data and exporting LCOV reports

[antvaset]

• Add the EnableCoverageCollection engine option. When this is turned on, the engine keeps track of how many times ELM nodes were visited during evaluation, for all libraries involved.
• Add BranchCollectionVisitor used to create a tree of branches from an ELM library.
• Add the exportLcovInfo() method that generates lcov.info with DA and BRDA records using node visit counts.
• Docs published at https://github.com/cqframework/clinical_quality_language/wiki/CQL-Code-Coverage

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

❌ Patch coverage is 79.48718% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.78%. Comparing base (01788ab) to head (1574faa).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...n/org/opencds/cqf/cql/engine/execution/Coverage.kt	84.88%	4 Missing and 9 partials ⚠️
...cqf/cql/engine/execution/CoverageTest/Library1.cql	72.22%	0 Missing and 5 partials ⚠️
...cqf/cql/engine/execution/CoverageTest/Library2.cql	25.00%	1 Missing and 2 partials ⚠️
...tlin/org/opencds/cqf/cql/engine/execution/State.kt	71.42%	1 Missing and 1 partial ⚠️
...ncds/cqf/cql/engine/execution/EvaluationVisitor.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1634      +/-   ##
============================================
+ Coverage     65.70%   65.78%   +0.07%     
  Complexity     1647     1647              
============================================
  Files           470      473       +3     
  Lines         27990    28107     +117     
  Branches       5429     5475      +46     
============================================
+ Hits          18391    18489      +98     
- Misses         7309     7313       +4     
- Partials       2290     2305      +15     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
88.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud