[11.x] Allow BackedEnum to be passed to Route::can()

[Omegadela]

Hi,

Like the recently merged #52677 and #52679 using enums improves code readability, maintainability and reduces the hassle of using string values within the code itself.

This PR proposes to add BackedEnum support to the can method on \Illuminate\Routing\Route, allowing to use it inline for simple routing.

Route::post('/request', function () {...})->can(Permissions::CAN_REQUEST);

This PR is backward compatible and shouldn't bring any breaking changes.

[Omegadela]

$ ./vendor/bin/phpunit --filter RouteCanBackedEnum
PHPUnit 11.3.5 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.2.23
Configuration: /srv/ro/www/phpunit.xml.dist

..                                                                  2 / 2 (100%)

Time: 00:01.196, Memory: 156.50 MB

OK (2 tests, 7 assertions)