Allow configuration of the number of informer workers

[mikewied]

Currently the number of workers in the informer is hardcoded to 1. Being able to set this number higher will allow operator to process multiple CRD updates at once. This will help the operator be more responsive when it is managing a large number of CRD's.

Note: I think 1 is definitely the right default.

[ib-steffen]

is there any reason why it has to be 1 at the moment? It seems that our operator is currently limited by this, because we manage many CRs at the same time. In our case we also create/delete them all the time, so there's really quite some work to be done by the operator.

[theishshah]

Number of Workers is now configurable!