Support Invokable Classes in Console Extender's schedule method

Current Behavior

When using the Console extender's schedule method, it's currently required to pass an instantiated object (either a closure or an invokable class). Based on the docblock and patterns in other extenders, there's an expectation that the method should also accept the ::class syntax for invokable classes. However, this isn't currently supported, leading to unexpected behavior.

(new Extend\Console())
    ->schedule(Console\ProcessEraseRequests::class, Console\DailySchedule::class); 
// Throws error: Call to undefined function Console\DailySchedule()

Steps to Reproduce

Create a new Console extender.
Use the schedule method with the ::class syntax for the callback.
Observe the error when the scheduled command is invoked.

Expected Behavior

(new Extend\Console())
    ->schedule(Console\ProcessEraseRequests::class, Console\DailySchedule::class); 
// Should work, given that Console\DailySchedule is an invokable class

Screenshots

No response

Environment

Flarum version: x.y.z
Website URL: http://example.com
Webserver: [e.g. apache, nginx]
Hosting environment: [e.g. shared, vps]
PHP version: x.y.z
Browser: [e.g. chrome 67, safari 11]

Output of `php flarum info`

Output of "php flarum info", run this in terminal in your Flarum directory.

Possible Solution

Modify the Console extender to support both instantiated objects and the ::class syntax for invokable classes. This can be done using a similar approach to the Filesystem extender, utilizing the ContainerUtil::wrapCallback method.

Additional Context

This inconsistency can lead to confusion, especially given that other extenders in Flarum handle both closures and invokable classes correctly.

Tests should be added to ensure that this behavior is correctly implemented and maintained in the future.

flarum / framework