add a feature flag to disable printlns in kcl-lib for the lsp

[jessfraz]

closes #2468

[qa-wolf]

QA Wolf here! As you write new code it's important that your test coverage is keeping up.
Click here to request test coverage for this PR!

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
modeling-app	✅ Ready (Inspect)	Visit Preview	Jun 20, 2024 2:35am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.54%. Comparing base (f1ef9d5) to head (f2c5ec0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2712      +/-   ##
==========================================
- Coverage   86.54%   86.54%   -0.01%     
==========================================
  Files          60       60              
  Lines       22779    22778       -1     
==========================================
- Hits        19714    19713       -1     
  Misses       3065     3065              

Flag	Coverage Δ
wasm-lib	86.54% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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