Remove generate:crud command.

[sebargarcia]

Remove generate crud command. It is not necessary anymore since generate:all command generates all files (resolver, inputs, filters, and sorts) from OT files the first time or you can use merlin watcher. So if you choose db-first strategy or code-first strategy you need only two files: entity file and OT file. If you use db-first, previously you use db-reverse command to generate entities and OT files. Then you use generate:all or watcher. If you use code-first you write your entities and OT files and synchronize with typeorm and then run generate:all or watcher.