Use shared informers

[floreks]

We should investigate the usage of shared informers in order to better handle Dashboard usage in large clusters. Currently, it puts a quite high load on the API server and on views such as workloads (all namespaces) basically might ask for tens of thousands of resources. The biggest issue now is memory usage. Using cache and better optimizing our API structures (less fields) should improve memory consumption significantly.

https://godoc.org/k8s.io/client-go/informers

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[maciaszczykm]

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