How to specify both the resource limit and resource request for JM/TM in flink-operator

[Liting Liu (litiliu)]

      Hi, community.  I wonder how can i specify both the resource request and 
limit for JM/TM in the podTemplate using flink-operator?  We have the need to 
set the request resource and limit resource to different value.

For example:
jobManager:
  limits:
    cpu: 500m
    memory: 500Mi
  requests:
    cpu: 1000m
    memory: 1024Mi
taskManager:
  limits:
    cpu: 500m
    memory: 1024Mi
  requests:
    cpu: 1000m
    memory: 2048Mi