feat: introduce hot reload system for views in development mode

[mgarciad34]

This PR introduces a lightweight Hot Reload system for development in CodeIgniter 4.

• Automatically starts Hot Reload when running php spark serve
• Adds a background watcher for app/Views
• Includes the partials/hotreload snippet for automatic browser reload
• Updated README with documentation for usage and configuration

No external tools (Node, Webpack, Vite) required. This feature is fully implemented in PHP.

[mergeable]

Hi there, mgarciad34! 👋

Thank you for sending this PR!

We expect the following in all Pull Requests (PRs).

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• All git commits must be GPG-signed
• Must follow our style guide
• Be commented in the PHP source file
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We expect all code changes or bug-fixes to be accompanied by one or more tests added to our test suite to prove the code works.

If pull requests do not comply with the above, they will likely be closed. Since we are a team of volunteers, we don't have any more time to work
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See https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md

Sincerely, the mergeable bot 🤖

[neznaika0]

Unfortunately, your PR is likely to be rejected. You are developing an existing library. In addition, in the app/ folder.

[totoprayogo1916]

@mgarciad34 feel free to see #7489

[mgarciad34]

Lamentablemente, es probable que tu solicitud de solicitud sea rechazada. Estás desarrollando una biblioteca existente. Además, en la carpeta app/ .

Puede ser, pero esta libreria se hace integramente en PHP.

[michalsn]

@mgarciad34 Thank you for trying to make CodeIgniter better, but as mentioned, the HotReload feature is already implemented, see: https://codeigniter.com/user_guide/testing/debugging.html#hot-reloading