sequelize: add missing constructor options, constructor signature

[kukoo1]

1. add missing constructor options according to Sequelize documentation (database, username, password, retry, typeValidation [only v4])
2. use RetryOptions interface for reuse and DRY purpose. {match?: string[], max?: number}
3. add missing constructor signature, refer to above documentation example:

// with database, username, and password in the options object
const sequelize = new Sequelize({ database, username, password });

Please fill in this template.

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).

Select one of these and delete the others:

If changing an existing definition:

• Provide a URL to documentation or source code which provides context for the suggested changes: http://docs.sequelizejs.com/class/lib/sequelize.js~Sequelize.html#instance-constructor-constructor
• Increase the version number in the header if appropriate.
• If you are making substantial changes, consider adding a tslint.json containing { "extends": "dtslint/dt.json" }.

[kukoo1]

@samuelneff Please review this PR :)