Implementation of Validation for ObjectListWidget.

[alexandreIFB]

Hello community,

This pull request introduces improvements to the field validation system within FormValidation. The goal is to resolve existing validation issues and enhance the overall architecture for widget custom validation.

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Problems Identified

1. ObjectListWidget Validation:
   The ObjectListWidget was not correctly validating the schemas of its internal objects.

2. Block Attribute Passing:
   In SearchBlockEdit.jsx, the block={block} attribute was not being properly passed to the component.

Changes

1. Custom Validation System for Widgets

   • Introduced a mechanism to register validators of type custom-validator-widget.
   • Errors from these validators are now stored in the internalErrors property of the field's error object.
   • This allows each widget to have a flexible and customizable validation structure and logic.

2. Structural Improvements

   • Moved ObjectListWidget to its own folder for better code organization.
   • Registered widgetValidators during the installDefaultWidgets process.
   • Fixed the passing of the block attribute in SearchBlockEdit.
   • Enabled forwarding of internalErrors within ObjectListWidget.

3. Functional Validator for ObjectListWidget

   • Implemented a validator that checks the schema of each item in the list.
   • Utilized FormValidation to validate items.

The main difference compared to regular wideget validators is that with internalErrors you can use any data structure you want and handle it in the way that best suits your case.

Feedback

I'm open to suggestions, especially regarding the approach for registering validators.

Closes #7077

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📚 Documentation preview 📚: https://volto--7078.org.readthedocs.build/

[alexandreIFB]

Maybe it will help #4415

[alexandreIFB]

Just a few minor docs style guide tweaks. I love PRs with docs! Thank you!

@stevepiercy Thank you for the suggestions, I have already made the indicated improvements.

[alexandreIFB]

@sneridagh You are right, I found a better solution by making just a few changes to what we already have to implement this custom validation for object_list, allowing internal schema validation. I reverted most changes and left a cleaner solution for this problem.

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