docs: Provide CN translation for 3 additionalfeatures docs

[Shen7436]

This PR:

• Adjusts some format issues and unclear expressions for clangtoolchain.rst, esp-terminal.rst, and heaptracing.rst in the docs/en/additionalfeatures folder based on Espressif Style Guide.
• Provides CN translation for above three docs.
• TODO: Closes DOC-12879, DOC-12883 once merged.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/translate_clangtoolchain_espterminal_heaptracing

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[Shen7436]

Hi @0cici @leeebo PTAL, thx!

[0cici]

Hi @Shen7436, pls check my comments. Overall LGTM~

[leeebo]

@Shen7436 LGTM!