Generic Pool Support for db-conn

Example

const dbConfig = {

}
const poolConfig = {
    min: 2,
    max: 5
}
const driver = new XXXDriver();
const pool: DataSource = new GenericPool(driver, dbConfig, poolConfig);
const conn1 = await pool.getConnection();
const conn2 = await pool.getConnection();
await conn1.close();
await conn2.close();
await pool.close();

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Test on Borrow

const dbConfig = {}
const poolConfig = {
    min: 2,
    max: 5
	testOnBorrow: true;
	testOnBorrowSql: "select 1";
}
const driver = new XXXDriver();
const pool: DataSource = new GenericPool(driver, dbConfig, poolConfig);

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