Add default planes to std

[nrc]

This removes the need for magic strings for default planes, although that probably needs a little more testing before I'd recommend it as the default.

In order to add the planes to std I needed to support type ascription for coercing a struct to a plane and negation for planes (to support -XZ, etc.). Although I don't restrict it's use, I wouldn't recommend documenting or recommending type ascription for users.

Internally, I add the concept of an uninitialised plane, which is one which has not been sent to the engine yet.

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[codecov]

Codecov Report

Attention: Patch coverage is 73.39056% with 124 lines in your changes missing coverage. Please review.

Project coverage is 85.86%. Comparing base (3ddce11) to head (6ab1682).

Files with missing lines	Patch %	Lines
src/wasm-lib/kcl/src/execution/kcl_value.rs	39.18%	45 Missing ⚠️
src/wasm-lib/kcl/src/parsing/ast/types/mod.rs	70.64%	32 Missing ⚠️
src/wasm-lib/kcl/src/execution/geometry.rs	62.50%	18 Missing ⚠️
src/wasm-lib/kcl/src/execution/exec_ast.rs	92.59%	10 Missing ⚠️
src/wasm-lib/kcl/src/parsing/ast/digest.rs	0.00%	4 Missing ⚠️
src/wasm-lib/kcl/src/std/args.rs	50.00%	4 Missing ⚠️
src/wasm-lib/kcl/src/walk/ast_node.rs	0.00%	4 Missing ⚠️
src/wasm-lib/kcl/src/execution/mod.rs	86.95%	3 Missing ⚠️
src/wasm-lib/kcl/src/walk/ast_visitor.rs	0.00%	2 Missing ⚠️
src/wasm-lib/kcl/src/parsing/parser.rs	96.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5433      +/-   ##
==========================================
- Coverage   86.02%   85.86%   -0.17%     
==========================================
  Files          95       95              
  Lines       35754    36076     +322     
==========================================
+ Hits        30757    30975     +218     
- Misses       4997     5101     +104     

Flag	Coverage Δ
wasm-lib	85.86% <73.39%> (-0.17%)	⬇️

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