Make mapped object auto initialization optional

[Marek Bartoš]

• It is not needed with PHP 8.1 and new in initializers
• It is easier to understand

@MappedObjectValue(Input::class, tryAutoInit=true)

[Marek Bartoš]

Related to #45 - auto initialization is currently applied only for root rule and new option would possibly break root detection. Maybe initialization through before callback would work?

[Marek Bartoš]

Solved by c3e4e55

[github-actions]

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