Suggest using the new PHP feature attributes

[ezsky]

Annotations are very frustrating to use. The IDE has poor support for it and is difficult to debug.
Suggest using the new PHP feature attributes，like https://github.com/uderline/openapi-php-attributes

[xepozz]

Totally agree

[nkondrashov]

Hi all! doctrine/annotations being optional as of version 4.8 for zircote/swagger-php (current used ^4.0). Current annotation can't be parsed for openapi.json anymore (Current state after installation: demo apps have error on /docs, also yii-debug-api cant join openapi.js).

I suggest next scenario:

1. Include doctrine/annotations in current composer json right now (for stabilization demo apps and yii-debug-api)
2. Issuing refactoring demo apps and yii-debug-api to use native PHP annotation
3. When complete step 2 - remove doctrine/annotations from composer json

p.s.
I hope I selected correctly place for this message