Toolips using single div reference

[jsheely]

@rtivital What are your thoughts against updating to use a single portal div that updates and positions it's content.

Right now creating tooltips generates a unique div in the DOM at the bottom of the body for each unique component reference.

In a perfect world we think it would make sense to have a single portal div that never is removed that simply moves into position and changes its content.

Do you see any downsides to this strategy? If not I will update the component

[rtivital]

Portal component is used in all Mantine components: Modal, Popover, Tooltip, etc. If this change is implemented, the Portal component stacking context (z-index) will be the same for all components.