fix(date): add file extensions on date-fns locale import

[C17AN]

Overview

Issue Link : https://github.com/toss/slash/issues/62

Target Package : @toss/date

Add .js extension on import statement to avoid import error.

Test Environment

Create-react-app

• AS-IS

• TO-BE

Create-next-app

• AS-IS

• TO-BE

PR Checklist

• [✅] I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

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