Add hasRole()

hasRole('some-resource', 'some-role'): Check if the authenticated user has especific role into a resource.

Ex: Whit this payload:

'resource_access' => [
  'myapp-backend' => [
      'roles' => [
        'myapp-backend-role1',
        'myapp-backend-role2'
      ]
  ],
  'myapp-frontend' => [
    'roles' => [
      'myapp-frontend-role1',
      'myapp-frontend-role2'
    ]
  ]
]

Auth::hasRole('myapp-backend', 'myapp-backend-role1') => true
Auth::hasRole('myapp-frontend', 'myapp-frontend-role1') => true
Auth::hasRole('myapp-backend', 'myapp-frontend-role1') => false