Enchase: 名前空間の外から名前空間内の変数に代入できるように

[ikasoba]

resolve #311

What

• 名前空間の外から名前空間内の変数に代入できるように
  • 名前空間のスコープが名前空間内で定義された変数を変更する際、親のスコープの変数を参照することで解消

Why

Additional info (optional)

テストも書いておきました。

[codecov]

Codecov Report

Patch coverage: 94.91% and project coverage change: +0.17% 🎉

Comparison is base (bc94751) 87.90% compared to head (25a7b37) 88.07%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
+ Coverage   87.90%   88.07%   +0.17%     
==========================================
  Files          20       20              
  Lines        3291     3372      +81     
  Branches      542      562      +20     
==========================================
+ Hits         2893     2970      +77     
- Misses        387      391       +4     
  Partials       11       11              

Files Changed	Coverage Δ
src/interpreter/scope.ts	93.36% <94.00%> (+0.23%)	⬆️
src/interpreter/index.ts	90.64% <100.00%> (+0.26%)	⬆️

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