feat: add support for association methods

[jsindos]

This PR adds support for sequelize association methods, as per

• Polymorphic/Helper Association methods do not appear in Typescript sequelize/sequelize#14637
• https://sequelize.org/docs/v6/other-topics/typescript/

For example, when providing the association csv, we will also get the following properties added (from the person <-> passport test data):

    declare getPassport: HasOneGetAssociationMixin<passport>;

    declare setPassport: HasOneSetAssociationMixin<passport, number>;

    declare createPassport: HasOneCreateAssociationMixin<passport>;

Note the following hasn't been added / run:

• linting
  • I ran npm run lint but get the following output, wondering if I can get some help on how to run automatic eslint fix on my changes using the project configuration

> sequelize-typescript-generator@11.0.8 lint
> eslint --fix --ext .ts output/*.ts


Oops! Something went wrong! :(

ESLint: 8.57.0

No files matching the pattern "output/*.ts" were found.
Please check for typing mistakes in the pattern.

• tests

  • I can run the tests and they all pass, but wasn't sure where to add testing for the new functionality. I looked into it('1:1', async () => { but it seems these tests are on the Sequelize models themselves, rather than the generated types.

• import statements

  • The import statements for the new Mixins are always added, should these instead be added conditionally or will linting clean this up automatically?

[jsindos]

It seems it also breaks when supplying -C arg