public / sequelize

Co-authored-by: Brian Schardt <35744893+brianschardt@users.noreply.github.com>
Co-authored-by: AllAwesome497 <47748690+AllAwesome497@users.noreply.github.com>

Co-authored-by: Pedro Augusto de Paula Barbosa <papb1996@gmail.com>

* meta: cleanup package.json

* meta: add some keywords to package.json

* meta: reorganize package.json scripts

* test: improve `test-unit` script in package.json

* test: refactor `rand()` function away from config

* test: cleanup config file

* meta: much better local development

Co-authored-by: Pedro Augusto de Paula Barbosa <papb1996@gmail.com>

Co-authored-by: Pedro Augusto de Paula Barbosa <papb1996@gmail.com>

Co-authored-by: papb <papb1996@gmail.com>

Co-authored-by: Pedro Augusto de Paula Barbosa <papb1996@gmail.com>

Co-authored-by: Pedro Augusto de Paula Barbosa <papb1996@gmail.com>

* test(mysql, mariadb): improve transaction tests

- Greatly improve test for `SELECT ... LOCK IN SHARE MODE`
- Greatly improve test for deadlock handling

* fix(mysql): release connection on deadlocks

This is a follow-up for a problem not covered by #12841.

* refactor(mariadb): `query.js` similar to mysql's

* Update comments with a reference to this PR