docs: add INFORMATION_SCHEMA REGION_INFO docs (EN + ZH)

[Copilot]

What's Changed in this PR

This PR documents the newly exposed information_schema.region_info inspection table from GreptimeDB and adds it to the INFORMATION_SCHEMA reference index. It also includes the corresponding Chinese localization so both language tracks stay aligned.

• INFORMATION_SCHEMA index updates

  • Added REGION_INFO entries in:
    • docs/reference/sql/information-schema/overview.md
    • i18n/zh/docusaurus-plugin-content-docs/current/reference/sql/information-schema/overview.md

• New REGION_INFO reference page (English)

  • Added docs/reference/sql/information-schema/region-info.md
  • Documents schema columns and field semantics (runtime state/role, sequences, manifest/version metadata, options, SST format, node id)
  • Includes a practical query pattern joining with REGION_PEERS to filter by table

• New REGION_INFO reference page (Chinese)

  • Added i18n/zh/docusaurus-plugin-content-docs/current/reference/sql/information-schema/region-info.md
  • Mirrors the English page structure and semantics for parity

USE INFORMATION_SCHEMA;
DESC REGION_INFO;

SELECT r.*
FROM REGION_INFO r
LEFT JOIN REGION_PEERS p ON r.region_id = p.region_id
WHERE p.table_name = 'region_info_case';

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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