Add service for MongoDBFormatter

[wimme002]

The MongoDBFormatter has sensible values in the constructor so I guess it can be added as a service in this bundle

[jmikola]

Suggested change

	<service id="monolog.formatter.mongo_db" class="Monolog\Formatter\MongoDBFormatter" public="false" />
	<service id="monolog.formatter.mongodb" class="Monolog\Formatter\MongoDBFormatter" public="false" />

[jmikola]

@GromNaN: Am I correct in assuming that defining a service here still requires it to be enabled via the formatter option for a handler definition? Per the custom formatter docs.

I expect this eventually would warrant changes to https://github.com/symfony/symfony-docs/blob/7.3/logging/formatter.rst as well to list this in the documentation.

[GromNaN]

Looking at Seldaek/monolog@c04d39d, the MongoDBFormatter is the one by default since Monolog 2.

We can create a new mongodb type handler that uses the service MongoDBFormatter by default as handler and passes the constructor options ($maxNestingLevel and $exceptionTraceAsString). Similar to this:

monolog-bundle/src/DependencyInjection/MonologExtension.php

Lines 668 to 678 in 43da9a3

	if (empty($handler['formatter'])) {
	$formatter = new Definition("Monolog\Formatter\FlowdockFormatter", [
	$handler['source'],
	$handler['from_email'],
	]);
	$formatterId = 'monolog.flowdock.formatter.'.sha1($handler['source'].'|'.$handler['from_email']);
	$formatter->setPublic(false);
	$container->setDefinition($formatterId, $formatter);
	$definition->addMethodCall('setFormatter', [new Reference($formatterId)]);
	}

[jmikola]

@GromNaN: I've incorporated the assignment of a default MongoDBFormatter in #550

This only applies to handlers created with the new mongodb syntax, and the default ctor args of MongoDBFormatter are used. If customer args are required, users can rely on the common formatter config syntax and specify a service ID.

[GromNaN]

Superseded by #550. Thank you @wimme002