Add PHP 8 attributes support

Implement a custom Annotation driver for support PHP 8 Attributes and old comment DOC block annotations in the same project.

Related article: https://www.doctrine-project.org/2021/05/24/orm2.9.html

Attributes support: doctrine/orm#8266

Most helpful comment: https://stackoverflow.com/a/68186091/9183782

SlowQuery can fail.

v3.3.1

Slow Query: table not exist

EntityManager methods flush(), remove(), persist() and addEventListener() should return void.

v3.3.0

EntityManager: Add phpstan-return void typehint (compatibility with D…

v3.2.3

SQLite3Cache: Fix codestyle.

v3.2.2

AbstractLogger: End event in case of first read.

v3.2.1

ApcuCache: Fix compatibility $lifeTime.

[BC BREAK] Compatibility with Doctrine 2.9

BC Break: The argument of flush() must be always empty.

v3.1.0

Extension: Add custom type: Better debug info.

v3.0.6

Remove SmartObject.

Fix compatibility with new Doctrine

v3.0.5

Extractor: Fix codestyle.