Popup does not change display speed when delay prop is set

[GrimzEcho]

Bug Report

The Popup component does not adjust its show or hide speed when the delay property is set.
The mouseEnterDelay and mouseLeaveDelay properties work, but they are undocumented and were only found after searching for "popup delay" in the project's issues.

Steps

1. Create a Popup like the following

const PopupExample = () => (
  <Popup
    content="Add users to your feed"
    trigger={<Button icon="add" />}
    delay={{ show: 2000, hide: 4000 }}
  />
);

Expected Result

The popup appears two seconds after mouseover and hides two seconds after the mouse leave

Actual Result

The popup appears immediately and hides immediately

Version

0.87

Testcase

https://codesandbox.io/s/8zo77xv0j2

Notes

My assumption is that Semantic-UI-React components should have all of the same options as normal Semantic-UI components, but perhaps this is incorrect. This is based on the link to the SUI docs from the SUI-React docs, and on the "Complete SUI component definition support" phrasing in the SUI-React's readme file

[welcome]

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We get a lot of issues on this repo, so please be patient and we will get back to you as soon as we can.

[layershifter]

We support only mouseEnterDelay and mouseLeaveDelay. They belong to Portal component and are mentioned there: https://react.semantic-ui.com/addons/portal/

The problem with missing docs for some props is tracked under #1169.