feat: add taplo formatter support for TOML files

[thiagohcaserta]

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Description

TOML files (.toml) are widely used across many ecosystems (Cargo.toml, pyproject.toml, Hugo, etc) but have no dedicated built-in formatter. While prettier can handle .toml, taplo is the native TOML toolkit and formatter, purpose-built for the format. Adding it as a built-in formatter would provide more accurate TOML formatting.

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