fix: properly give placeholder types

[discord9]

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Refer to a related PR or issue link (optional)

What's changed and what's your intention?

properly give placeholder types.

because it seems datafusion will not give data type to placeholder if it need to be cast to certain type(i.e. expr like cast(placeholder), still unknown if this is a feature or a bug. And if a placeholder expr have no data type, datafusion will fail to extract it using LogicalPlan::get_parameter_types

After this fix, running the below command with any table in public

sea-orm-cli generate entity \
    -u mysql://root:root@localhost:4002/public \
    -o src/entities

will only cause sea-orm-cli to crash, before this command will cause db's thread to panic

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.

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