public / sequelize

* refactor(hooks): remove method aliases for hooks

BREAKING CHANGE:

In order to streamline API:

- All method style add hook functions have been removed in favor of a composition based approach.
- Hook names have been removed, you can add and remove them by function reference instead which was supported before.
- Another notable change that `this` inside of hooks no longer refers to the the the hook subject, it should not be used.

This affects `Model`, `Sequelize` and `Transaction`.

#### Composition

Before: `MyModel.beforeCreate(...)`
After: `MyModel.hooks.add('beforeCreate', ...)`

Before: `MyModel.addHook('beforeCreate', ...)`
After: `MyModel.hooks.add('beforeCreate', ...)`

Before: `MyModel.removeHook('beforeCreate', ...)`
After: `MyModel.hooks.remove('beforeCreate', ...)`

Before: `transaction.afterCommit(...)`
After: `transaction.hooks.add('afterCommit', ...)`

#### Names

Before:

```js
MyModel.addHook('beforeCreate', 'named', fn);
MyModel.removeHook('beforeCreate', 'named');
```

After:

```js
MyModel.hooks.add('beforeCreate', fn);
MyModel.hooks.remove('beforeCreate', fn);
```

#### Scope

Before: `MyModel.addHook('beforeCreate', function() { this.someMethod(); });`
After: `MyModel.hooks.add('beforeCreate', () => { MyModel.someMethod(); });`

BREAKING CHANGE:
All CLS support has been removed.

Migration guide:
If you do not use CLS, you can ignore this.
Check all your usage of the `.transaction` method and make you sure explicitly pass the `transaction` object for each subsequent query.

BREAKING CHANGE:

`Model.build` has been removed. Use `Model.bulkBuild` or `new Model` instead.

Co-authored-by: Simon Schick <demwizzy@gmail.com>

BREAKING CHANGE:

If you have relied on accessing sequelize operators via `Symbol.for('gt')` etc. you must now prefix them with `sequelize.operator` eg.
`Symbol.for('sequelize.operator.gt')`

BREAKING CHANGE:

Operator aliases were soft deprecated via the `opt-in` option
`operatorAlises` in v5 they have been entirely removed.

Please refer to previous changelogs for the migration guide.

BREAKING CHANGE:

Only NodeJS v8 and greater are now supported