Create operator managing the number of consumers

[valerykalashnikov]

File generator is able to generate file from some Mbs to some GBs. Because of it we possibly need to change the amount of consumers multiple times manually. If we will not do it the queue could get stuck or in case of using multiple consumers, most of them will be mostly idle.

For solving this problem we need to create an operator changing the amount of consumer pods.
The operator should have a possibility to point the minimum and maximum amount of consumers and be configured to have an access to redis server