Migrate show users/roles statement to new planner

[junnplus]

Signed-off-by: Ye Sijun junnplus@gmail.com

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

Summary about this PR

Changelog

• New Feature

Related Issues

#5777

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1 Ignored Deployment

Name	Status	Preview	Updated
databend	⬜️ Ignored (Inspect)		Jun 16, 2022 at 7:10AM (UTC)

[mergify]

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[TCeason]

Need to add show in check func

   /// Check if statement is supported by InterpreterFactoryV2
    pub fn check(stmt: &DfStatement) -> bool {
        matches!(
            stmt,
            DfStatement::Query(_)
                | DfStatement::Explain(_)
                | DfStatement::CreateStage(_)
                | DfStatement::ShowStages(_)
                | DfStatement::DescribeStage(_)
                | DfStatement::List(_)
                | DfStatement::DropStage(_)
                | DfStatement::RemoveStage(_)
                | DfStatement::ShowDatabases(_)
                | DfStatement::ShowCreateDatabase(_)
                | DfStatement::ShowTables(_)
                | DfStatement::ShowCreateTable(_)
                | DfStatement::DescribeTable(_)
                | DfStatement::ShowTablesStatus(_)
                | DfStatement::CreateTable(_)
                | DfStatement::CreateView(_)
                | DfStatement::AlterView(_)
                | DfStatement::DropTable(_)
                | DfStatement::UndropTable(_)
                | DfStatement::AlterTable(_)
                | DfStatement::RenameTable(_)
                | DfStatement::TruncateTable(_)
                | DfStatement::OptimizeTable(_)
                | DfStatement::DropView(_)
                | DfStatement::ShowMetrics(_)
                | DfStatement::ShowProcessList(_)
                | DfStatement::ShowSettings(_)
                | DfStatement::CreateDatabase(_)
                | DfStatement::DropDatabase(_)
                | DfStatement::CreateUser(_)
                | DfStatement::AlterDatabase(_)
        )
    }

[TCeason]

/lgtm