Add support for extra attributes on sidebar NavigationItem

[Abdulmajeed-Jamaan]

Description

Introduces the HasExtraAttributes trait to NavigationItem and updates the sidebar group Blade view to pass extra attributes to sidebar items. This allows for more flexible customization of sidebar item components while maintaining the same look and responsiveness.

For example:

• opening globally registered modal using ['x-on:click.prevent' => "$wire.dispatch('open-custom-modal')"]
• add custom classes on demand for targeting with css, for example making primary color of the first navigation item that is made for call to action behavior

Visual changes

None

Functional changes

• Code style has been fixed by running the composer cs command.
• Changes have been tested to not break existing functionality.
• Documentation is up-to-date.

[Abdulmajeed-Jamaan]

Another mention with similar goal as well, #10771