RFC: consider renaming "Annotations" to "Attributes"

[andrew-demb]

Initially, the term "annotations" was used due to the lack of native PHP support for meta annotations over methods and properties.

After PHP 7, PHP introduced attributes - a native instrument available via PHP reflection to add meta information.

GraphQLite dropped support for Doctrine annotations after #677 (GraphQLite 7)

What about changing naming used everywhere - use attribute instead of annotation?

Examples:

• graphqlite/src/Annotations/MiddlewareAnnotationInterface.php

  Lines 7 to 10 in 5403473

  	/**
  	* A marker interface for annotations meant to be used in middlewares
  	*/
  	interface MiddlewareAnnotationInterface

• graphqlite/src/Annotations/Cost.php

  Line 5 in 5403473

  namespace TheCodingMachine\GraphQLite\Annotations;

[oojacoboo]

I agree - PR is welcomed.