Add dependent table to `hybridse::vm::ExplainOutput`

**Is your feature request related to a problem? Please describe.**

In order to query SQL, we must call `Explain` to obtain the `ExlainInfo` and call `GetDependentTables` to get dependent tables.
In this issue, we are going to add dependent tables info into `ExlainInfo`.

**Describe the solution you'd like**

**Describe alternatives you've considered**

**Additional context**

Look at the hybridse::vm::ExplainOutput structure and the GetDependentTables function to understand how dependent tables are currently obtained. Modify ExplainOutput to include dependent tables information, ensuring the change is consistent across the codebase. Test by running existing SQL query tests to verify the new info is correctly populated.

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