Using CreationOptional leads to issues due to CreationAttributeBrand not being exported

Issue Creation Checklist

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Bug Description

Typescript compilation error when using CreationOptional.
error TS4053: Return type of public method from exported class has or is using name 'CreationAttributeBrand' from external module "..." but cannot be named.

Reproducible Example

import { CreationOptional, InferAttributes, InferCreationAttributes, Model } from 'sequelize';

export class Test extends Model<InferAttributes<Test>, InferCreationAttributes<Test>> {
  declare id: CreationOptional<number>;
}

in another file

class TestClass {
  async test() {
    return (await Test.create({})).id;
  }

What do you expect to happen?

Expect code to compile.

What is actually happening?

Code does not compile.

Environment

• Sequelize version: 6.32.1
• Node.js version: v16.17.1
• TypeScript version: 4.9.4

Would you be willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time and I know how to start.
• Yes, I have the time but I will need guidance.
• No, I don't have the time, but my company or I are supporting Sequelize through donations on OpenCollective.
• No, I don't have the time, and I understand that I will need to wait until someone from the community or maintainers is interested in resolving my issue.

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