[Bundle Split] Configuration loading

[Vincz]

So, I started to work on the isolation of the configuration process.
The result will be 4 additional bundles:

• GraphQLConfigurationXmlBundle
• GraphQLConfigurationYamlBundle
• GraphQLConfigurationGraphQLBundle
• GraphQLConfigurationMetadataBundle

The configuration generation would no longer be part of the Dependency Injection / Container builder process (ie. Removal of ConfigParserPass) but will be a regular service (used by the TypeGenerator).
The main advantages is that the configuration processing will be a regular service and we will be able to extend it, easily add features, remove all static classes, etc...
You can have a look at the bundles here https://github.com/Vincz/graphql-bundles
And at the modified main bundle here: https://github.com/Vincz/GraphQLBundle/tree/config-generator

The "problems" I'm facing are the following:

1. The namespaces are really long, like for example: Overblog\GraphQL\Bundle\ConfigurationMetadataBundle\Transformer\ArgumentsTranformer
2. The mapping configuration would now be set in the sub bundles configuration, like:

overblog_graphql_configuration_yaml:
    mapping_directories: 
        - "%kernel.project_dir%/config/types"
        - "%kernel.project_dir%/config/queries"
        - "%kernel.project_dir%/config/mutations

3. We have to duplicate the tests, phpstan, phpcs, CI config for each bundle instead of only in the main one (unless we could do that in a main root repositories with different packages? I see this a lot in the Javascript world but not so much in PHP. Example in JS: https://github.com/mui-org/material-ui).
4. The namespace of annotations would change from Overblog\GraphQLBundle\Annotation to Overblog\GraphQL\Bundle\ConfigurationMetadataBundle\Metadata (as now both annotations and attributes are supported with the same classes, and will be even more when Default property with @NamedArgumentConstructor doctrine/annotations#402 will be publish).

It's not really "problems", it's more like consequences of the split.
Let me know what you think.