feat: refactor index option and move index option validation code to `SqlClusterRouter`

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Index key, ttl, ttl_type verify logic should be placed in `DB` or in `CORE`

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1. Refeactor ColumnIndexNode. We only keep general structure.
2. Move `ttl`, `ttl_type`, `verson` logic to `OPENMLDB`
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Look at the ColumnIndexNode structure and the SqlClusterRouter class to understand the current index option validation logic. Determine which parts are general and which are specific to OPENMLDB. Move ttl, ttl_type, and version validation to the appropriate location, ensuring the refactored code maintains functionality.

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