Related PRs:

• IBX-9727: Fixed strict types of Core Imagine integration layer  #619

Description:

Added strict type hints to field type layer (contracts and implementation).
For now this is just a preview as it's not finished yet. Targeting #619 to have better clarity overall what has been done regarding IBX-9727 and what's still missing.

For QA:

Sanity checks, regression build.

Documentation:

Breaking changes

• \Ibexa\Contracts\Core\FieldType\FieldType::validateFieldSettings contract now expects its first argument to be
  of an array<string, mixed> type.
• \Ibexa\Contracts\Core\FieldType\FieldType::getValidatorConfigurationSchema contract returns now strict array and
  hints a hash map (array<string, mixed>) as its shape.
• \Ibexa\Contracts\Core\FieldType\FieldType::getSettingsSchema contract returns now strict array and hits a hash
  map (array<string, mixed>) as its shape.
• \Ibexa\Contracts\Core\FieldType\FieldType::applyDefaultSettings contract now expects its first argument to be of an
  array<string, mixed> type.
• \Ibexa\Contracts\Core\FieldType\FieldType::isSearchable contract returns now strict bool.
• \Ibexa\Contracts\Core\FieldType\FieldType::isSingular contract returns now strict bool.
• \Ibexa\Contracts\Core\FieldType\FieldType::onlyEmptyInstance contract returns now strict bool.
• \Ibexa\Contracts\Core\FieldType\FieldType::getEmptyValue contract returns now strict
  \Ibexa\Contracts\Core\FieldType\Value. Implementations can return covariant types of
  \Ibexa\Contracts\Core\FieldType\Value.
• \Ibexa\Contracts\Core\FieldType\FieldType::isEmptyValue contract returns now strict bool.
• \Ibexa\Contracts\Core\FieldType\FieldType::fromHash contract returns now strict
  \Ibexa\Contracts\Core\FieldType\Value. Implementations can return covariant types of
  \Ibexa\Contracts\Core\FieldType\Value.
• \Ibexa\Contracts\Core\FieldType\FieldType::toHash contract returns now strict mixed type. Implementations not
  defining a strict return type at all need to be updated.
• \Ibexa\Contracts\Core\FieldType\Value::__toString contract returns now strict string type. Make sure your custom
  field type values implementations return the same. The interface itself declares strict types.
• Core field type Value classes' (\Ibexa\Core\FieldType\*\Value) members (properties) are now strictly typed and
  readonly (except for Binary File-based field types). Instead of overriding their properties, instantiate a new
  Value.
• \Ibexa\Core\FieldType\FieldType::getSortInfo method accepts now a strict \Ibexa\Contracts\Core\FieldType\Value
  type and returns a strict mixed type. Implementation return type can be covariant.