Debug collector

[xepozz]

A collector for debugging is needed.
Similar to https://github.com/yiisoft/validator/blob/master/src/Debug/ValidatorCollector.php is enough for the first iteration

In general would be nice to collect:

• In-out hydration result: ['service', '5'] => new Model($serviceFromContainer, 5)
• Data mutations: ['a', '5'] => new Model('abc', '555')
• Data types mutations: '5' => 5