feat(window-state): make flags optional in js side

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Package Changes Through 8a6f1e8b72b4248cb5aa4ec9dcb09fee3391d2fe

There are 2 changes which include window-state with minor, window-state-js with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
window-state	2.3.0	2.4.0
window-state-js	2.3.0	2.4.0

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