feat: improve SQL execution

Summary

• feat: call unprepare for each exec session

• feat: improve SQL execution

1. Enhanced SQL caching mechanism: now, both leaf and branch motions in the query plan are cached more aggressively.
2. Improved SQL execution: The system now utilizes the Rust API from the module instead of Lua.

• Depends on picodata/tarantool!200, sbroad!502 (closed), tarantool-module!540 (closed)

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• Close #...
• Cherry-pick to: none
• Docs follow-up: not necessary