Support loading AccessLogHandler and ErrorHandler from Container

[clue]

This changeset adds support for loading the AccessLogHandler and ErrorHandler from the Container. They can now be given explicitly to the App like this:

<?php

require __DIR__ . '/../vendor/autoload.php';

$app = new FrameworkX\App(
    FrameworkX\AccessLogHandler::class,
    FrameworkX\ErrorHandler::class
);

// Register routes here, see routing…

$app->run();

On top of this, you may now configure the default handlers with an explicit DI container configuration like this:

<?php

require __DIR__ . '/../vendor/autoload.php';

$container = new FrameworkX\Container([
    FrameworkX\AccessLogHandler::class => fn () => new FrameworkX\AccessLogHandler(),
    FrameworkX\ErrorHandler::class => fn () => new FrameworkX\ErrorHandler()
]);

$app = new FrameworkX\App($container);

// Register routes here, see routing…

$app->run();

This is the next step in adding more options to control access logging and error handling in follow-up PRs as discussed in #169 and #170.

Builds on top of #173 and #174