Support using import statements for non-KCL files

[nrc]

This allows using import statements rather than the import std library command.

Outstanding work:

• imports in the artifact graph and the timeline (I'm not sure how imports are/should be represented here, will do this as a follow-up unless the current approach (do nothing) breaks things)
• units, coords, and explicit format (I plan to support these as attributes in a follow-up PR)
• remove import function and make import a keyword (follow-up PR after some deprecation time)

[vercel]

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Name	Status	Preview	Updated (UTC)
modeling-app	✅ Ready (Inspect)	Visit Preview	Jan 22, 2025 4:56am

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[codecov]

Codecov Report

Attention: Patch coverage is 79.57746% with 87 lines in your changes missing coverage. Please review.

Project coverage is 86.12%. Comparing base (67cc4f5) to head (02450d0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/wasm-lib/kcl/src/execution/import.rs	72.54%	56 Missing ⚠️
src/wasm-lib/kcl/src/parsing/parser.rs	81.44%	18 Missing ⚠️
src/wasm-lib/kcl/src/execution/mod.rs	91.95%	7 Missing ⚠️
src/wasm-lib/kcl/src/parsing/ast/types/mod.rs	64.70%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5122      +/-   ##
==========================================
- Coverage   86.15%   86.12%   -0.04%     
==========================================
  Files          89       90       +1     
  Lines       32450    32603     +153     
==========================================
+ Hits        27958    28079     +121     
- Misses       4492     4524      +32     

Flag	Coverage Δ
wasm-lib	86.12% <79.57%> (-0.04%)	⬇️

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