feat(deno-client): support mysql

[mrl5]

I'm using https://deno.land/x/[email protected]/mod.ts only because https://deno.land/x/[email protected]/mod.ts has bug that I described in denodrivers/mysql#128 (comment)

hopefully this bug will be fixed soon, then I guess we can switch from https://github.com/sail-sail/mysql2 to https://github.com/denodrivers/mysql

tested locally with:

import { mysqlClient, mySql } from "./mysql.ts";

const db = {
    host: '0.0.0.0',
    port: 3306,
    user: 'root',
    password: 'change-me',
    database: 'test',
};

const conn = await mysqlClient(db);
await conn.execute('CREATE TABLE IF NOT EXISTS pets (name varchar(255), kind varchar(255))');
await conn.execute('INSERT INTO pets VALUES (?, ?)', ['behemot','cat']);
const [r] = await conn.execute('SELECT * from pets');
conn.end();
console.log(r);

const kind = 'cat';
const { rows } = await mySql(db)`SELECT * from pets WHERE kind = ${kind}`;
console.log(rows);