Timeline Module missing module export

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Plunkr Case (Bug Reports)

Reproduction case : https://stackblitz.com/edit/github-f6xfzg?file=src/app/app.component.ts

Current behavior

When importing the TimelineModule only, the content, opposite and marker can't be customized.

Expected behavior

The TimelineModule should be customizable.

What is the motivation / use case for changing the behavior?

I want to use the TimelineModule independently.

• Angular version: 9.X but also tested on 11.X

• PrimeNG version: 11.3.0-rc.1

Additionnal information

I went through the code of the TimelineModule and noticed that the module doens't exports SharedModule like other modules (eg. CardModule).
I followed the documentation and the sample code imports both TimelineModule and CardModule, which one of them exports SharedModule so we can use the pTemplate directive.

CardModule: https://github.com/primefaces/primeng/blob/master/src/app/components/card/card.ts#L104
TimelineModule: https://github.com/primefaces/primeng/blob/master/src/app/components/timeline/timeline.ts#L87

On the other hand, if you only want to import the TimelineModule, the pTemplate directive isn't recognized and the <ng-template> wont work properly.

I can open a PR to add the SharedModule export on the TimelineModule is you want.