Add Webpush notification provider

[DoidoYo]

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Description

Add Web push notification provider for progressive web apps, works with most modern browsers on desktop, iOS and theoretically android (tested on windows 10 edge, chrome. macOS safari, chrome. iOS safari.)

• Fixes In browser push / notification #3489
• Fixes iOS 16.4 will support notifications for web apps #2792
• Fixes App for Android with push notification Integrated #2351

Type of change

Please delete any options that are not relevant.

• User interface (UI)
• New feature (non-breaking change which adds functionality)
• Other

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas (including JSDoc for methods)
• My changes generates no new warnings
• My code needed automated testing. I have added them (this is optional task)

NOTES

1. HTTPS is needed for this to work. Specifically for non localhost urls (tested on Mac safari and chrome). For iOS: HTTPS + page added to Home Screen.
2. serviceWorker is needed for web push, had to install Vite PWA in order to attach a service worker to the application. ** OF NOTE ** Service worker is only attached in production, NOT attached in dev. will not work in dev
3. "Webpush Documentation" can be an Uptime Kuma wiki page with more detailed info on point 1 above. I can write it up after code approval.

Screenshots (if any)

[CommanderStorm]

looks reasonable.

I have not had time to work if it works, but here are a few code comments to unblock you.

[DoidoYo]

@CommanderStorm just pushed latest changes with fixes for comments. thank you for the feedback!

[CommanderStorm]

Notification provider looks good from my point of view.
I just merged master, but thought that I had edit rights to your repo - I have not, since you opened the PR from master.

Please run npm install for merging.

[DoidoYo]

@CommanderStorm I ran NPM INSTALL and pushed the updated "package-lock.json" file. Apologies for the delay. Please let me know if anything else is needed.

[CommanderStorm]

@DoidoYo there seems to be a merge conflict preventing merging.
Due to the above mentioned issue, I need you to resolve the conflict.