chore: refine the query queue is_heavy_action func

[BohuTANG]

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

Summary

• spill out a new function: is_heavy_action, to check a query is heavy or light, if heavy will add to queue.
• add unit test for difference plan.

#[tokio::test(flavor = "multi_thread")]
async fn test_heavy_actions() -> Result<()> {
    struct Query {
        sql: &'static str,
        add_to_queue: bool,
    }

    let queries = [
        Query {
            sql: "create table t1(a int)", // DDL
            add_to_queue: false,
        },
        Query {
            sql: "select 1",
            add_to_queue: false,
        },
        Query {
            sql: "select version()", // FUNCTION
            add_to_queue: false,
        },
        Query {
            sql: "select * from numbers(10)", // Table Function
            add_to_queue: false,
        },
        Query {
            sql: "begin", // BEGIN
            add_to_queue: false,
        },
        Query {
            sql: "kill query 9", // KILL
            add_to_queue: false,
        },
        Query {
            sql: "select * from system.queries_queue", // SYSTEM
            add_to_queue: false,
        },
        Query {
            sql: "explain select * from system.queries_queue", // EXPLAIN SYSTEM
            add_to_queue: false,
        },
        Query {
            sql: "explain select * from t1", // EXPLAIN SELECT
            add_to_queue: false,
        },
        Query {
            sql: "insert into t1 values(1)", // INSERT
            add_to_queue: true,
        },
        Query {
            sql: "copy into t1 from @s1", // COPY INTO
            add_to_queue: true,
        },
        Query {
            sql: "copy into @s1 from (select * from t1)", // COPY INTO
            add_to_queue: true,
        },
        Query {
            sql: "update t1 set a = 2", // UPDATE
            add_to_queue: true,
        },
        Query {
            sql: "delete from t1", // DELETE
            add_to_queue: true,
        },
        Query {
            sql: "replace into t1 on(a) values(1)", // REPLACE INTO
            add_to_queue: true,
        },
        Query {
            sql: "merge into t1 using (select * from t2) as t2 on t1.a = t2.a when matched then delete",
            // MERGE INTO
            add_to_queue: true,
        },
    ];

• Fixes #[Link the issue here]

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):