Deprecate TypeNode#has_attribute? and remove references to "attribute"

[HertzDevil]

Resolves #9943.

[straight-shoota]

TypeNode#has_attribute? is part of the public API and would need to be deprecated before complete removal. So the documentation should stay (supplemented by @[Deprecated("Use #annotation instead")]), and the implementation should issue a deprecation notice.
The implementation can be based on annotation, the AST methods can be removed right away.

[HertzDevil]

If there is a better way of reporting warnings from the macro interpreter please let me know (Crystal is able to report deprecated macros defined in Crystal code, but src/compiler/crystal/macros.cr is purely documentation and doesn't actually define these methods).