feat: configuration for seamless cli use in a typescript project

[malik-samad]

• In this commit, I have modified the templates and made other related changes to add support for typescript projects.

• The new changes I made, will automatically detect if the project that uses sequelize-cli is on typescript or not and will switch logic based on it.

Pull Request check-list

Please make sure to review and check all of these items:

• [x] Does npm run test pass with this change (including linting)?
• [x] Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
• [ ] Have you added new tests to prevent regressions?
• [ ] Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

Description of change

Link to the issue: https://github.com/sequelize/cli/issues/1436

The sequelize-cli didn't have the support for typescript projects and in this PR I implemented certain changes that will make it capable of handling the CLI for both typescript and javascript files, additionally, I have improved the templates to be able to generate both .ts and .js files for migrations, models, and seeds.

[malik-samad]

going to re-open it with another branch