Keep non-Latin handles on import, or transliterate them

Handles with Chinese, Japanese, Korean, Cyrillic, Arabic, or other non-Latin characters now import the way Shopify treats them, and a new option converts them to English letters when you want that instead.

🚀 What’s new

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• Convert handles to English letters - a new import option converts handles to English letters before matching, so 男裝上衣 becomes nan-zhuang-shang-yi (see Convert non-Latin handles to ASCII).
• CLI flag - altera import create accepts --transliterate-handles to turn the option on from the command line.

🐛 Fixes

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• Non-Latin handles - re-importing products or collections with Chinese, Japanese, Korean, Cyrillic, Arabic, or other non-Latin handles updates the existing item instead of duplicating it.
• Non-Latin redirect paths - finding an existing redirect by a path with non-Latin characters now works, so handle-change redirects and redirect imports update it instead of failing.