feat: docsと同じ型注釈を行えるようにする

[takejohn]

What

関数宣言および関数型でのジェネリクスと、ユニオン型、error型、never型の型注釈ができるようになります。

Why

• Resolves docsと同じ型注釈を実際に行えるようにする #856

Additional info (optional)

common.tsから型注釈のパースを行う関数をtypes.tsに切り出しました。

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.59664% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/type.ts	68.18%	14 Missing ⚠️
src/parser/syntaxes/types.ts	96.33%	4 Missing ⚠️
src/parser/plugins/validate-keyword.ts	88.88%	2 Missing ⚠️

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Files with missing lines	Coverage Δ
src/interpreter/index.ts	94.84% <100.00%> (+9.04%)	⬆️
src/node.ts	85.71% <ø> (-12.66%)	⬇️
src/parser/plugins/validate-type.ts	100.00% <100.00%> (+17.64%)	⬆️
src/parser/scanner.ts	94.52% <100.00%> (+5.75%)	⬆️
src/parser/syntaxes/common.ts	96.58% <100.00%> (+7.05%)	⬆️
src/parser/syntaxes/expressions.ts	94.82% <100.00%> (+5.63%)	⬆️
src/parser/syntaxes/statements.ts	97.41% <100.00%> (+4.15%)	⬆️
src/parser/token.ts	100.00% <100.00%> (ø)
src/parser/visit.ts	100.00% <100.00%> (+5.26%)	⬆️
src/parser/plugins/validate-keyword.ts	97.12% <88.88%> (+8.50%)	⬆️
... and 2 more

... and 19 files with indirect coverage changes