Add Rust client docs, Rust syntax highlighting

[slvrtrn]

Summary

Most of the things from https://github.com/ClickHouse/clickhouse-rs/tree/main?tab=readme-ov-file#clickhouse-rs were moved to the docs repo

I added several new sections

• Paul Loyd recognition as the original author
• An explicit link to the examples
• HTTPS/CH Cloud connection
• Async insert example
• Slightly adjusted inserter example (with end call mentioned in the code as it caused confusion)
• DDLs with wait_end_of_query
• CH settings usage examples
• QueryID, SessionID examples
• Custom HTTP headers example
• Custom HTTP client example
• CANNOT_READ_ALL_DATA troubleshooting
• "Contact us"

Leftovers for the follow-ups:

• Rework "Data Types" section, especially when the data types examples PR is merged
• Add more docs based on the current/past issues in the client repo

Checklist

• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/en/integrations/index.mdx