Can't mock magic methods for \Aws\S3\S3Client

\Aws\S3\S3Client has way too many magic, e.g. for method `putObject()`
So when I try to mock this method it's treated as a property. Possible solution is to explicitly specify if it's a method or a property:
```
\Codeception\Stub::makeEmpty(
\Aws\S3\S3Client::class,
[
'putObject()' => 'result',
],
);
```

Start at Codeception\Stub::makeEmpty and trace how the supplied putObject() entry is interpreted for an Aws\S3\S3Client. Reproduce the mocking case, then verify that explicit method syntax is handled as a method while existing property stubbing remains unchanged.

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