Adds option to disable syncing across tabs

[joshnuss]

A new config option to disable syncing across tabs.

Usage

const store = persisted(key, initial, { syncTabs: true })

Default is true, to maintain backwards compatibility.

[bertmad3400]

When I first looked at this PR, it seemed strange and unnecessary to me, but after thinking the use-cases through, it actually makes a lot of sense. Would be awesome to have in the lib

[joshnuss]

Thanks for the feedback @bertmad3400,

I think it can lead to one tab overwriting another's local storage (race conditions), but in some cases, that's OK.

For example, when storing preferences in local storage, it could be weird if changes in one tab adjusted the other tab.
It's fine if the last one to update wins.

[github-actions]

🎉 This PR is included in version 0.8.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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