Declare parts of std in KCL rather than Rust

[nrc]

This PR lets us declare consts and functions (which can be written in either KCL (no example in this PR) or Rust) in std using KCL (which lets us have consts in std and thus in code-completions and docs), it moves the in-memory constants to std and introduces constants to replace the (now-deprecated) functions for maths constants (the latter are breaking changes, but I've left the old functions for now). I've moved cos to KCL as a test case (not a breaking change). This PR shouldn't break any code.

Outstanding work:

• support KW calls to KCL std functions
• doc comments on args (or extract them from the function comment)
• open std in editor for jump to def, etc.
• docs on types in KCL std
• migrate other functions and types to KCL
• let std functions refer to their environment (currently can't be done but not an issue since they're all in Rust anyway)

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[codecov]

Codecov Report

Attention: Patch coverage is 84.98331% with 135 lines in your changes missing coverage. Please review.

Project coverage is 86.10%. Comparing base (8c5662e) to head (25a90e2).

Files with missing lines	Patch %	Lines
src/wasm-lib/kcl/src/docs/kcl_doc.rs	84.26%	73 Missing ⚠️
src/wasm-lib/kcl/src/parsing/ast/types/mod.rs	56.60%	23 Missing ⚠️
src/wasm-lib/kcl/src/modules.rs	36.00%	16 Missing ⚠️
src/wasm-lib/kcl/src/execution/exec_ast.rs	91.66%	11 Missing ⚠️
src/wasm-lib/kcl/src/execution/mod.rs	79.16%	5 Missing ⚠️
src/wasm-lib/kcl/src/docs/gen_std_tests.rs	97.84%	3 Missing ⚠️
src/wasm-lib/kcl/src/lsp/kcl/mod.rs	84.21%	3 Missing ⚠️
src/wasm-lib/kcl/src/std/mod.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5147      +/-   ##
==========================================
+ Coverage   85.85%   86.10%   +0.24%     
==========================================
  Files          94       95       +1     
  Lines       34639    35293     +654     
==========================================
+ Hits        29741    30390     +649     
- Misses       4898     4903       +5     

Flag	Coverage Δ
wasm-lib	86.10% <84.98%> (+0.24%)	⬆️

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