enhance: プロパティアクセスのドット記法に予約語や文字列を使えるように

[takejohn]

What

プロパティアクセスのドット記法に予約語や文字列を使えるようになります。
例:

let x = {}
x.default = 0
x.public = 1
x."藍" = 2

Why

• Resolves プロパティアクセスのドット記法に予約語を使えるように #971
• Resolves オブジェクトのキーを文字列でも書けるように #62

Additional info (optional)

[codecov-commenter]

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✅ All modified and coverable lines are covered by tests.
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Files with missing lines	Coverage Δ
src/parser/plugins/validate-keyword.ts	100.00% <100.00%> (+11.38%)	⬆️
src/parser/syntaxes/expressions.ts	95.45% <100.00%> (+6.26%)	⬆️

... and 28 files with indirect coverage changes

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[syuilo]

👍