@Intlify/shared deepCopy implementation is slow when lazy loading locales

[Rigo-m]

Environment

• Operating System: Darwin
• Node Version: v20.16.0
• Nuxt Version: 3.13.2
• CLI Version: 3.14.0
• Nitro Version: 2.9.6
• Package Manager: bun@1.1.29
• Builder: -
• User Config: -
• Runtime Modules: -
• Build Modules: -

Reproduction

TODO

Describe the bug

DeepCopy implementation seems a bit slow, testing in a real life scenario with i18n lazy loading locale files with ~1.9k rows

Additional context

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