feat(idl): add function return analysis to type checking

[dhower-qc]

No description provided.

[dhower-qc]

@henrikg-qc FYI, this is going to enforce that every non-void function returns or terminates (forcing us to eliminate the c++ compiler warnings)

[codecov]

Codecov Report

❌ Patch coverage is 22.53521% with 55 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.73%. Comparing base (76e076c) to head (bbb64fe).
⚠️ Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/ruby-gems/idlc/lib/idlc/ast.rb	22.85%	54 Missing ⚠️
tools/ruby-gems/idlc/lib/idlc/passes/prune.rb	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (22.53%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1732      +/-   ##
==========================================
- Coverage   70.87%   70.73%   -0.14%     
==========================================
  Files          49       49              
  Lines       27714    27781      +67     
  Branches     6534     6572      +38     
==========================================
+ Hits        19641    19652      +11     
- Misses       8073     8129      +56     

Flag	Coverage Δ
idlc	74.70% <22.53%> (-0.22%)	⬇️
udb	63.62% <ø> (-0.02%)	⬇️

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.

🚀 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.

[ThinkOpenly]

I presume this shouldn't be included.

[ThinkOpenly]

Not a terribly skilled review, but nothing screams out.