[php-slim4] Switch to Packaged Body Parsing Middleware
Created by: ybelenko
Is your feature request related to a problem? Please describe.
Custom JSON parsing middleware isn't necessary anymore. Latest version of PHP Slim4 already contains Body Parsing Middleware
Describe the solution you'd like
- Remove custom JSON parsing middleware file from generation.
- Enable packaged Body Parsing Middleware
I will take care of it after #9208 merge to avoid conflicts and double review.