feat: Add automation to manage stale issues and PRs

### 🚀 The feature

### Description:

Currently, the repository does not have any automated mechanism to manage inactive (stale) issues and pull requests. As a result, many old issues and PRs remain open indefinitely, even when they are no longer relevant or actively being worked on. This leads to:

- Cluttered issue tracker
- Increased maintenance overhead
- Difficulty in identifying active vs inactive work
- Slower triaging process for maintainers

To improve repository hygiene and reduce manual effort, we propose adding an automated Stale Issue Bot using GitHub Actions.

### Proposed Solution:

We propose implementing a Stale Issue Bot using the actions/stale GitHub Action. The bot will automatically monitor issues and pull requests and take the following actions:

✅ Behavior of the bot

1. If an issue or PR has been inactive for 60 days:
- The bot will post a comment notifying that it has become stale.
- The bot will add a stale label to the issue/PR.
2. If there is no activity for 7 more days after marking it stale:
- The bot will automatically close the issue or PR.

**Proposed Implementation :**
A new workflow file should be added:
```
.github/workflows/stale-bot.yml
```

**Expected Benefits:**

This automation will:

- Keep the repository clean and organized
- Reduce manual effort for maintainers
- Help prioritize active issues and PRs
- Prevent outdated discussions from lingering indefinitely