Add type to KclValue::Number

[nrc]

Another step towards UoM types. Again, there are no user-visible changes here.

This PR adds a type to KclValue::Number. It initialises this for literals with either the specified of default units, but doesn't use it for any checking or conversion. I've done some of the low-hanging fruit of propagating the types, but mostly that is left for future work (as shown by the prevalence of Unknown).

[qa-wolf]

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[jtran]

😃

Looks like numeric negation is just about the only thing that propagates the type, but this is exciting!

[nrc]

😃

Looks like numeric negation is just about the only thing that propagates the type, but this is exciting!

There's a bit more than that - I spiked out some of the propagation between numbers and geometry too, but yeah there's a lot to do still

[codecov]

Codecov Report

Attention: Patch coverage is 89.01734% with 19 lines in your changes missing coverage. Please review.

Project coverage is 85.85%. Comparing base (5d02a27) to head (10cb4df).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/wasm-lib/kcl/src/execution/kcl_value.rs	80.32%	12 Missing ⚠️
src/wasm-lib/kcl/src/std/args.rs	86.95%	6 Missing ⚠️
src/wasm-lib/kcl/src/execution/exec_ast.rs	97.22%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5380      +/-   ##
==========================================
+ Coverage   85.84%   85.85%   +0.01%     
==========================================
  Files          94       94              
  Lines       34506    34639     +133     
==========================================
+ Hits        29622    29741     +119     
- Misses       4884     4898      +14     

Flag	Coverage Δ
wasm-lib	85.85% <89.01%> (+0.01%)	⬆️

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