UoM types in AST, unnamed annotations, and syntax for importing from std

[nrc]

This is preparatory work for declaring std using KCL (extracted from #5147).

Numeric suffixes are now preserved in the AST, but we still don't actually have any effect. (But it means formatting the AST won't drop them, etc).

[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	Feb 10, 2025 7:20pm

[nrc]

This PR also fixes a few bugs/omissions:

• accept empty bodies for functions
• accept std lib names as identifiers
• some bugs around sending scene units to the engine for isolated executions

[codecov]

Codecov Report

Attention: Patch coverage is 63.55685% with 125 lines in your changes missing coverage. Please review.

Project coverage is 85.89%. Comparing base (74bdb72) to head (db32de1).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/wasm-lib/kcl/src/parsing/ast/types/mod.rs	54.44%	41 Missing ⚠️
src/wasm-lib/kcl/src/parsing/parser.rs	66.30%	31 Missing ⚠️
src/wasm-lib/kcl/src/execution/mod.rs	62.50%	21 Missing ⚠️
src/wasm-lib/kcl/src/execution/exec_ast.rs	74.32%	19 Missing ⚠️
src/wasm-lib/kcl/src/parsing/token/mod.rs	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5324      +/-   ##
==========================================
- Coverage   86.04%   85.89%   -0.15%     
==========================================
  Files          92       92              
  Lines       33261    33456     +195     
==========================================
+ Hits        28620    28738     +118     
- Misses       4641     4718      +77     

Flag	Coverage Δ
wasm-lib	85.89% <63.55%> (-0.15%)	⬇️

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.