feat: update some interceptor to carry more information

[sunng87]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

• Will carry parse promql Expr to pre_execute
• Carry Option<&Statement> to SqlQueryInterceptor

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

[gemini-code-assist]

Code Review

This pull request refactors QueryContext to consolidate mutable fields—including extensions, snapshot sequences, and SST minimum sequences—into a single RwLock protected structure, thereby removing redundant Arc wrapping. The interceptor API was updated, specifically modifying pre_execute to accept optional statements and adding PromQL expression support to PromQueryInterceptor. Additionally, the changes incorporate performance optimizations by utilizing unwrap_or_else for lazy string allocations and cleaning up unnecessary string conversions and mutable variable declarations throughout the codebase. I have no feedback to provide.