Support invokable console commands

[maryo]

Symfony 7.3 introduced invokable commands - plain classes with a public __invoke() method that don't extend Command at all. This PR adds support for that.

What changed

ConsoleExtension no longer only looks for services via findByType(Command::class). A service is now registered as a console command if it meets at least one of these conditions:

• it extends Symfony\Component\Console\Command\Command (unchanged, existing behavior)
• it carries the console.command tag
• it's annotated with #[AsCommand]

Services that don't extend Command are wrapped into a synthetic console.<service>.command Command instance via Command::setCode(), the same way Symfony's own AddConsoleCommandPass does it for the framework bundle. If a service is tagged/annotated but neither extends Command nor has a public __invoke() method, a Nette\DI\ServiceCreationException is thrown.

Also adds support for #[AsCommand]'s usages option (extra usage examples shown in --help).
This bumped the minimum required symfony/console version to ^7.4.0 (from ^7.2.0), since that's when the usages parameter was added to the attribute.

Dropped the Command::$defaultName property fallback - the currently installed Command class (and the whole ^7.4.0 || ^8.0.0 range we now require) no longer declares that property at all, having replaced it first with getDefaultName() and later with #[AsCommand], so this branch could only ever fire for a hand-rolled Command subclass still using the pre-Symfony-5.0 convention, which isn't realistic to encounter alongside such a recent symfony/console requirement.

Symfony also supports #[AsCommand] on individual methods, so the method doesn't have to be named __invoke and a single class can expose multiple commands this way. I didn't want to add that complexity here, so I only added support for __invoke.

[codecov]

Codecov Report

❌ Patch coverage is 90.47619% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.65%. Comparing base (0d0e339) to head (9234fed).

Files with missing lines	Patch %	Lines
src/DI/ConsoleExtension.php	90.47%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
- Coverage   96.07%   94.65%   -1.43%     
==========================================
  Files           5        5              
  Lines         102      131      +29     
==========================================
+ Hits           98      124      +26     
- Misses          4        7       +3     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[maryo]

After looking at the Codecov report, I bumped the minimum required version of symfony/console and added a bit more coverage. What's still uncovered isn't easy to test, so I wouldn't worry about it.