Add global defaults.normalization_context.gen_id configuration option

[olinox14]

Q	A
Branch?	main
Tickets	None
License	MIT
Doc PR	api-platform/docs#2252

Add the possibility to set a new option in api/config/packages/api_platform.yaml (or config/api-platform.php for Laravel) :

api_platform:
    defaults:
        normalization_context:
            gen_id: false

If set to false, this will globally disable the Skolem IRIs generation for all properties.
If not set, the default value for $context['output']['gen_id'] would stay true.
#[ApiProperty(genId: true|false)] will still take precedence.

[soyuka]

Hi thanks for the feature! Could you add a test (functional or unit your choice)?

I wonder if it would be nice to have actual property defaults.