Feature Request - product tour component

#### Please describe the feature you would like to request.

A comprehensive product tour component/library to guide users.
#### What is the use-case or motivation for this proposal?

There aren't any solutions that are flexible enough for the moment.

#### Is there anything else we should know?

existing solutions:

free/open-source
http://bootstraptour.com/
http://benmarch.github.io/angular-ui-tour/#/docs
https://angular-ui.github.io/ui-tour/demo/demo.html
https://github.com/NMilicic/ngx-bootstrap-product-tour
https://github.com/isaacplmann/ngx-tour
https://github.com/tnicola/ngx-joyride

Commercial:
https://helphero.co/

The issue names no repository files, tests, or entry points. Review the listed product-tour libraries and clarify the required scope and flexibility before identifying an Angular component integration point; done means an agreed comprehensive product-tour component or library.

Written by the indexing model from the issue text.