PF4 Tooltip: add support for right-aligned content

This is a follow-up to #3013.

Why only support a left aligned option? What if designers want to support right-aligned content, next?

Even if we don’t support right-aligned content for now, something more like this would scale better in the future.

contentPosition?: 'bottom' | 'center' | 'right';

Then we could create an enum

export enum TooltipContentPosition {
  bottom = 'bottom',
  center = 'center',
  right = 'right'
}

Looks like we already take this approach for the position property.

_Originally posted by @dlabrecq in https://github.com/patternfly/patternfly-react/pull/3053_

[dlabrecq]

We can probably close the issue

[mcarrano]

Yes, one could right-align the tooltip text, but it does not seem like a good solution from a readability standpoint IMO.