Fix TracksLogWarn messages aren't logged with Cocoapods integration

[jaclync]

Fixes #262

Why

Recently, we noticed a Tracks event wasn't actually tracked due to a validation error that wasn't logged anywhere in the console p1693362956666449/1692625489.705669-slack-C039133E1M3 / woocommerce/woocommerce-ios#10574.

Automattic-Tracks-iOS/Sources/Event Logging/TracksEventService.m

Lines 59 to 61 in aad902b

	BOOL isValid = [tracksEvent validateObject:&error];
	if (!isValid) {
	TracksLogWarn(@"Error when validating TracksEvent: %@", error);

Upon inspection, TracksLoggingClass() is nil when the library is integrated with the client app via Cocoapods:

Automattic-Tracks-iOS/Sources/Model/ObjC/Common/TracksLogging.m

Lines 6 to 18 in aad902b

	static Class<TracksLoggingConfiguration> result = nil;
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
	#if SWIFT_PACKAGE
	Class loggingClass = NSClassFromString(@"AutomatticTracksModel.TracksLogging");
	#else
	Class loggingClass = NSClassFromString(@"TracksLogging");
	#endif
	if ([loggingClass conformsToProtocol: @protocol(TracksLoggingConfiguration)]) {
	result = loggingClass;
	}
	});
	return result;

I'm guessing the Cocoapods path wasn't tested, and thus Tracks logging has been disabled for a while.

How

To fix the nil TracksLoggingClass(), the logging class was updated to include the module name so that the class can be loaded correctly 7dd7d5d.

For easier debugging, the event name is now included in the warning message when there is a validation error creating a Tracks event bce4ea9.

To enable the client app to log a different message on Tracks event creation error, a success boolean is returned when creating an event with custom properties a9bfbbc. The return value is default to be discardable in Objective-C.

Testing steps

Please follow the testing steps in woocommerce/woocommerce-ios#10577.

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• I have considered if this change warrants release notes and have added them to the appropriate section in the CHANGELOG.md if necessary.

[ThomazFB]

Tested alongside woocommerce/woocommerce-ios#10577 ✅