Allow replace AbstractAdminBlockService by EditableBlockService

[wbloszyk]

Subject

Based on sonata-project/dev-kit#785 AbstractAdminBlockService should be replace by extends AbstractBlockService implements EditableBlockService. To do it this methods should be replaced:

• buildEditForm => configureEditForm
• buildCreateForm => confiureCreateForm
• validateBlock => validate
• getBlockMetadata => getMetadata

This change will allow move code to new methods with keep BC. In second step in 4.x branch we can add AbstractAdminBlockService implement EditableBlockService. In third step we can add support for BlockBundle v4 in sonata 3 (with some little BC-break).

I am targeting this branch, because this change respect BC.

Changelog

### Added
- Added `Sonata\BlockBundle\Form\Mapper\BlockFormMapper` class for allow use `FormMapper` with AdminBundle
- Added some methods to `Sonata\BlockBundle\Block\Service\AbstractAdminBlockService` for feature compatibility:
    - `configureEditForm()`
    - `configureCreateForm()`
    - `validate()`
    - `getMetadata()`

[VincentLanglet]

In third step we can add support for BlockBundle v4 in sonata 3 (with some little BC-break).

We should not.

• Every BC-break should be forbidden on current branch
• We should focus on Sonata 4 instead

We just need to support BlockBundle 4 on Sonata 4.

[core23]

This class is already deprecated, no need to change anything right here

[core23]

We should not need any AdminBundle reference. We decoupled this bundle from the admin bundle on the 4.x branch

[wbloszyk]

This code is use only when user generate form for Block in Admin site.

[VincentLanglet]

It would still need to require sonataAdmin on master https://github.com/sonata-project/SonataBlockBundle/blob/master/composer.json

The right way should be to add this code on sonataAdmin instead, if necessary.

[core23]

AFAIK we only need this mapping for the PageBundle:
https://github.com/sonata-project/SonataPageBundle/blob/3.x/src/Mapper/PageFormMapper.php

[VincentLanglet]

So it could be directly added to the PageBundle then

[core23]

So it could be directly added to the PageBundle then

Already done ;)

[github-actions]

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