Refactor source ranges into a generic node type

[jtran]

Replaces #4281. This is a step towards #4240.

This factors source ranges out of AST types and into a single Node<T> type. Using serde-flatten, the JSON representation and corresponding parsed JS object stay the same. This should make it much easier to add or change fields that are common to all AST nodes.

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[codecov]

Codecov Report

Attention: Patch coverage is 90.74853% with 110 lines in your changes missing coverage. Please review.

Project coverage is 86.07%. Comparing base (0d52851) to head (dc2ede9).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/wasm-lib/kcl/src/ast/types.rs	77.64%	93 Missing ⚠️
src/wasm-lib/kcl/src/executor.rs	78.57%	6 Missing ⚠️
src/wasm-lib/kcl/src/ast/types/condition.rs	0.00%	5 Missing ⚠️
src/wasm-lib/kcl/src/walk/ast_node.rs	87.50%	3 Missing ⚠️
src/wasm-lib/kcl/src/parser/parser_impl.rs	99.82%	1 Missing ⚠️
src/wasm-lib/kcl/src/std/kcl_stdlib.rs	0.00%	1 Missing ⚠️
src/wasm-lib/kcl/src/walk/ast_walk.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4350      +/-   ##
==========================================
+ Coverage   85.86%   86.07%   +0.21%     
==========================================
  Files          77       78       +1     
  Lines       27434    27621     +187     
==========================================
+ Hits        23557    23776     +219     
+ Misses       3877     3845      -32     

Flag	Coverage Δ
wasm-lib	86.07% <90.74%> (+0.21%)	⬆️

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[adamchalmers]

Wow, great job, this is a huge refactor, but it's worth it. Thanks so much!

[jtran]

It was a team effort, for sure!