refactor type declarations for nodes

[marihachi]

What

ノードのグループをCSTとASTの2種類に変更。

より一般的な名前に変更。

• Ast → Cst
• N → Ast

型宣言の機能: 関連ノードの宣言変更とCST/ASTノードへの統合。

今までTypeSourceはノードとは別物として扱っていたが、普通のノードと同様に扱うようにする。

• fnノード: プロパティ名 args[].type → args[].argType
• fnノード: プロパティ名 ret → retType
• TypeSourceのnamedノード: ノード名 named → namedTypeSource
• TypeSourceのfnノード: ノード名 fn → fnTypeSource

Why

ノードの型宣言の改善のため。

Additional info (optional)

[codecov]

Codecov Report

Base: 86.47% // Head: 86.53% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (a8355d1) compared to base (ae197be).
Patch coverage: 95.80% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #215      +/-   ##
==========================================
+ Coverage   86.47%   86.53%   +0.05%     
==========================================
  Files          19       19              
  Lines        2758     2770      +12     
  Branches      430      430              
==========================================
+ Hits         2385     2397      +12     
  Misses        366      366              
  Partials        7        7              

Impacted Files	Coverage Δ
src/type.ts	52.25% <44.44%> (-4.97%)	⬇️
src/interpreter/index.ts	90.25% <88.88%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/node.ts	97.67% <100.00%> (+0.13%)	⬆️
src/parser/index.ts	82.95% <100.00%> (ø)
src/parser/node.ts	99.00% <100.00%> (+0.04%)	⬆️
src/parser/plugins/infix-to-fncall.ts	98.34% <100.00%> (ø)
src/parser/plugins/set-attribute.ts	81.25% <100.00%> (ø)
src/parser/plugins/transform-chain.ts	94.87% <100.00%> (ø)
src/parser/plugins/validate-keyword.ts	97.61% <100.00%> (ø)
... and 2 more

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[syuilo]

🙏🏻