feat: stdをインタプリタから分離

[uzmoi]

What

インタプリタがデフォルトではprintとreadlineとCore名前空間内のもの以外のグローバル変数を定義しなくしました。
stdのエクスポート形式や粒度は要検討。
Coreはインタプリタと密結合（二項演算子など）なため引き続き上書き不可能な形で定義しています。

Why

Resolve #671

Additional info (optional)

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 89.92248% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/interpreter/lib/core.ts	88.59%	13 Missing ⚠️
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Files with missing lines	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)
src/interpreter/index.ts	72.11% <100.00%> (ø)
src/interpreter/lib/std.ts	82.92% <100.00%> (ø)
src/interpreter/lib/core.ts	88.59% <88.59%> (ø)

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