feat: Setting background synchronization

[tofers]

PR Details

Implementing “background synchronization” provides better WhatsApp Web performance.

Motivation and Context

My clients selectively started complaining about sessions dropping out. After scanning, the session would work for a little while and would stop working. I implemented background synchronization and it helped. I think this feature will be useful

How Has This Been Tested

I tried to enable this option and the problem with clients disappeared. Maybe it's a coincidence with the update, but I left it enabled anyway.

Environment

• Machine OS: Centos 8 and Docker
• Phone OS: IOS
• Library Version: 1.26.1-alpha.2
• WhatsApp Web Version: 2.3000.1017261806
• Puppeteer Version: 23
• Browser Type and Version: Chrome/121.0.6167.160
• Node Version: v20.9.0

Types of changes

• Dependency change
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• I have updated the documentation accordingly (index.d.ts).
• I have updated the usage example accordingly (example.js)

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