Add MySQL support to neko-sql using mysql2

[Copilot]

Description

Adds MySQL database support to neko-sql using the mysql2 library, following the existing PostgreSQL and SQLite implementation patterns.

Implementation:

• MysqlConnection: Connection pooling, transactions (BEGIN/COMMIT/ROLLBACK), database management operations, identifier validation/escaping
• MysqlQueryGrammar: Standard query compilation with MySQL-specific insertGetId handling
• MysqlSchemaGrammar: Overrides serial type to compile as INT AUTO_INCREMENT NOT NULL instead of PostgreSQL's serial

Usage:

import { MysqlConnection } from '@devbro/neko-sql';

const conn = new MysqlConnection({
  host: 'localhost',
  database: 'mydb',
  user: 'myuser',
  password: 'mypassword',
  port: 3306,
});

await conn.connect();
const query = conn.getQuery();
const results = await query.table('users').whereOp('id', '=', 1).get();
await conn.disconnect();

Checklist

• lint/prettier
• updated docs with new feature/details
• added tests that cover changes
• Add jsdocs for any added function/class

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• undefined
  • Triggering command: /usr/lib/postgresql/16/bin/psql /usr/lib/postgresql/16/bin/psql --host undefined --user undefined --port 5432 postgres -c CREATE DATABASE test_db_tj9xdo (dns block)
  • Triggering command: /usr/lib/postgresql/16/bin/psql /usr/lib/postgresql/16/bin/psql --host undefined --user undefined --port 5432 postgres -c CREATE DATABASE test_db_nfvfka (dns block)
  • Triggering command: /usr/lib/postgresql/16/bin/psql /usr/lib/postgresql/16/bin/psql --host undefined --user undefined --port 5432 postgres -c CREATE DATABASE test_db_kpav93 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>neko-sql add support for mysql</issue_title>
<issue_description>use mysql2 library</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes neko-sql add support for mysql #142

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