Introduced StructValidator to unpack validation errors for structs

[Steveb-p]

🎫 Issue	N/A

Description:

This PR introduces StructWrapperValidator (which implements ValidatorInterface from Symfony).

It is intended to decorate Symfony's Validator and unpack errors coming from struct assertions. This means it does not require any additional processing on the side of services, as long as the structs are packed using either the provided wrapper abstract, or the wrapper interface.

Before:

After:

For QA:

Documentation:

[adamwojs]

Could you please open counterpart PR in ibexa/collaboration?

[Steveb-p]

Could you please open counterpart PR in ibexa/collaboration?

If you wish to, sure. On it.

[Steveb-p]

@konradoboza Added one additional change: 84ee00f

When working on ibexa/collaboration, I realized that the developer needs to always remember to mark struct as @Assert\Valid (using annotation/attribute/YAML).
So I've added this annotation to the ValidationStructWrapperInterface::getStruct() method, which makes Validator to assume that the object returned has to be valid (which makes sense, right?).
This uncovered the fact that, when done this way, struct. will always be the right prefix to use (as we're not relying on a property name anymore). So it made ValidationStructWrapperInterface::getStructName() no longer needed for anything.

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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