feat(laravel): add name_converter option

[Seb33300]

Q	A
Branch?	main
Tickets	Closes api-platform/api-platform#2869
License	MIT
Doc PR

Same option as the api_platform.name_converter option in Symfony.

[soyuka]

For laravel features that are already available in Symfony we're allowing these to be merged on lower branches, I've added a test and as Laravel Eloquent's models are already snake_case you need to set null if you want snake case. Keep the default if you want camelCase. Thanks for the contribution.