Investigate extracting common Core/Client functionality in favour of reusability

[ndricimrr]

Some parts of Luigi Core/Client are some times shared with Luigi Container.

Investigate and come up with a strategy to have a common shared folder where multiple packages use the same implementation if possible/feasible

Topics to start with:

1. Web Component Creation Code is very similar (Core-Container) (if not almost identical)

• core/src/web-components.js
• container/src/services/webcomponents.service.ts
  Might be worth to have both Core and Container use the same code base for this functionality.

2. Luigi Client API - Container Client API

• createClientAPI function on Container for webcomponents is supposed to emulate the Luigi Client API. Since they are very similar it might be worth investigating what functionality could be shared

... other ideas that might come up

Another requirement is that this change would have us switch all core/client code from JS to Typescript.

New proposed folder structure

core/
client/
container/
common/    <----- this could be one way to save the shared common functionality