refactor: 仮引数をparamにリネーム

[uzmoi]

What

タイトルの通り

Why

Resolve #750

Additional info (optional)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 82.35294% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/type.ts	40.00%	6 Missing ⚠️

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Files with missing lines	Coverage Δ
src/interpreter/index.ts	94.30% <100.00%> (+8.50%)	⬆️
src/interpreter/util.ts	69.23% <100.00%> (+1.25%)	⬆️
src/interpreter/value.ts	100.00% <100.00%> (ø)
src/node.ts	85.71% <ø> (-12.66%)	⬇️
src/parser/plugins/validate-keyword.ts	88.42% <100.00%> (-0.19%)	⬇️
src/parser/plugins/validate-type.ts	100.00% <100.00%> (+17.64%)	⬆️
src/parser/syntaxes/common.ts	93.75% <100.00%> (+4.22%)	⬆️
src/parser/syntaxes/expressions.ts	92.51% <100.00%> (+3.32%)	⬆️
src/parser/syntaxes/statements.ts	97.35% <100.00%> (+4.09%)	⬆️
src/parser/visit.ts	100.00% <100.00%> (+5.26%)	⬆️
... and 1 more

... and 19 files with indirect coverage changes

[FineArchs]

一応ホスト向けの変更を含むので、ChangelogにFor Hostsとして記載をお願いします。