Added Pumble Notification

[cs-jako]

⚠️ Please Note: We do not accept all types of pull requests, and we want to ensure we don’t waste your time. Before submitting, make sure you have read our pull request guidelines: Pull Request Rules

❗ Important Announcement

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🚧 Temporary Delay in Feature Requests and Pull Request Reviews

At this time, we may be slower to respond to new feature requests and review pull requests. Existing requests and PRs will remain in the backlog but may not be prioritized immediately.

• Reason: Our current focus is on addressing bugs, improving system performance, and implementing essential updates. This will help stabilize the project and ensure smoother management.
• Impact: While no new feature requests or pull requests are being outright rejected, there may be significant delays in reviews. We encourage the community to help by reviewing PRs or assisting other users in the meantime.
• What You Can Do: If you're interested in contributing, reviewing open PRs by following our Review Guidelines or offering support to other users is greatly appreciated. All feature requests and PRs will be revisited once the suspension period is lifted.

We appreciate your patience and understanding as we continue to improve Uptime Kuma.

🚫 Please Avoid Unnecessary Pinging of Maintainers

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📋 Overview

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• What problem does this pull request address?

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• What features or functionality does this pull request introduce or enhance?

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🔄 Changes

🛠️ Type of change

• 🐛 Bugfix (a non-breaking change that resolves an issue)
• ✨ New feature (a non-breaking change that adds new functionality): Notification Provider
• ⚠️ Breaking change (a fix or feature that alters existing functionality in a way that could cause issues)
• 🎨 User Interface (UI) updates
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🔗 Related Issues

• Relates to #issue-number
• Resolves #issue-number
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📄 Checklist *

• 🔍 My code adheres to the style guidelines of this project.
• ✅ I ran ESLint and other code linters for modified files.
• 🛠️ I have reviewed and tested my code.
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📷 Screenshots or Visual Changes

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Event	Before
UP
DOWN
Certificate-expiry
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ℹ️ Additional Context

Provide any relevant details to assist reviewers in understanding the changes.

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This is related to my previous pull request (5342) which I closed after some time of inactivity.

Key Considerations:

• Design decisions – Key choices or trade-offs made during development.
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💬 Requested Feedback

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[CommanderStorm]

LGTM, Thanks.

Will merge into 2.1 once we branch into that direction, until then, will leave this open.
Please don't delete your repo, even if this takes a while, that closes this PR.

[cs-jako]

Thank you!

[CommanderStorm]

Moving from 2.1 to 2.0.0-beta.3 as really low risk