Validate default values

[mabar]

During metadata validation, check whether default values are valid according to validation rules

Needs:

• 39 resolved

• processor dependency
• "all is optional" validation mode set

Any errors should raise only warning, because things like options context may still break the defaults

[mabar]

Tried to implement and it lead to infinite recursive calls. Cyclical dependencies were fine, passing processor to MetaLoader->load() instead of having processor as a dependency.

But even if I solved recursive calls - it wouldn't work. Rules already transform data and they don't and shouldn't expect already transformed data. Even worst would it be with #14 - default values will be objects and not data from which objects are created.

[github-actions[bot]]

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