Angular v22

# Issue type

feature request

# Issue description

Since Angular v22 has been released, I would like to request official support for Angular 22 in Nebular.

## Current behavior

The latest version of Nebular does not officially support Angular 22 and still relies on peer dependency versions targeting older Angular releases. When installing Nebular in an Angular 22 project, developers may encounter dependency conflicts, warnings, or compatibility concerns during installation and build processes.

Additionally, Angular 22 introduces several improvements and new features that Nebular could take advantage of, including:

* Improved performance and build optimizations.
* Enhanced Signals ecosystem and reactivity APIs.
* Better hydration and server-side rendering capabilities.
* Updated standalone component experience.
* Improved tooling, diagnostics, and developer experience.
* Compatibility with the latest Angular CLI and framework APIs.

## Expected behavior

Nebular should officially support Angular 22 out of the box, including:

* Updated peer dependencies for Angular 22.
* Full compatibility with Angular 22 applications.
* Support for Angular 22 standalone APIs and latest framework features.
* Documentation and examples verified against Angular 22.
* CI/CD testing against Angular 22 to ensure long-term compatibility.

Official Angular 22 support would allow developers to adopt the latest Angular version while continuing to use Nebular without dependency workarounds or compatibility concerns.