New PSR for data querying

[alexandre-daubois]

A new PSR to standardize how data can be queried.

Here is the Google Groups thread: https://groups.google.com/g/php-fig/c/bKg4OvW-wcY

[samdark]

Interesting. We have a different approach to similar problem at Yii: https://github.com/yiisoft/data

[alexandre-daubois]

@samdark I really like how you managed filters! This is a great way to do this I didn't think of!