feat(query-generation): support for addFields INTELLIJ-194

[kmruiz]

Description

Checklist

• New tests and/or benchmarks are included.
• Documentation is changed or added.
• Changelog is updated accordingly.
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement).

Open Questions

[github-actions]

Coverage Report

Overall Project	79.98% -0.04%	✅
Files changed	84.82%	✅

File	Coverage
Project.kt	94.12%	✅
AddFields.kt	94.12% -5.88%	✅
Aggregate.kt	89.32% -4.27%	🚫
MongoshBackend.kt	84.25% -0.29%	✅

[github-actions]

🤖 Benchmark Comparison for chore: support for addFields and improve pretty printing

Benchmark	Previous	Current	Change
com.mongodb.jbplugin.jmh.SampleBenchmark.init	2,605,491,949.56 ops/s	2,660,529,840.29 ops/s	2.11%

[github-actions]

🤖 Benchmark Comparison for chore: update changelog

Benchmark	Previous	Current	Change
com.mongodb.jbplugin.jmh.SampleBenchmark.init	2,605,491,949.56 ops/s	2,674,102,544.84 ops/s	2.63%