feat(useWindowSize): support includeScrollbar

[vaakian]

scrollbar size is included in window.innerWidth / window.innerHeight, we don't want it in some cases.
For example, to calculate the top/left/right/bottom offset for a position: fixed element.

Description

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
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[songjianet]

LGTM