feat: Add window events "pagehide" / "pageshow"

[jdufresne]

What:

Add window events "pagehide" / "pageshow" to fireEvent API.

Why:

MDN documentation for these events is at:

https://developer.mozilla.org/en-US/docs/Web/API/Window/pagehide_event https://developer.mozilla.org/en-US/docs/Web/API/Window/pageshow_event

By adding these events, it allows library users to use the familiar fireEvent & friends in their test environments to verify pagehide and pageshow behavior.

How:

Add the events as entries in src/event-map.js.

Checklist:

• [ ] Documentation added to the docs site N/A
• [x] Tests
• [x] TypeScript definitions updated
• [x] Ready to be merged

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