feature: Convenient methods for getting component type instances

[Spomky]

Hi,

As explained in #711. Please note that I am no typescript developer, so please do not hesitate to show me the right way for implementing this. Also, I am not sure of the naming for these functions. In particular, I propose e.g. getTooltipList() while getTooltips() whould be more appropriate to me. This is due to weird cases that are Dismiss and Tabs where getTabss() makes no sense. Could be completely removed if you disagree with these methods.

Kind regards.