* Check if Pod matches inter-pod anti-affinity of other pod on node as part of NodeFit()
* Add unit tests for checking inter-pod anti-affinity match in NodeFit()
* Export setPodAntiAffinity() helper func to test utils
* Add docs for inter-pod anti-affinity in README
* Refactor logic for inter-pod anti-affinity to use in multiple pkgs
* Move logic for finding match between pods with antiaffinity out of framework to reuse in other pkgs
* Move interpod antiaffinity funcs to pkg/utils/predicates.go
* Add unit tests for inter-pod anti-affinity check
* Test logic in GroupByNodeName
* Test NodeFit() case where pods matches inter-pod anti-affinity
* Test for inter-pod anti-affinity pods match terms, have label selector
* NodeFit inter-pod anti-affinity check returns early if affinity spec not set
* pod anti-affinity check among nodes
* avoid pod equality check with UID field
also add node equality check with Name for short-cut
* add test case for anti-affinity violation among different node
* reduce ListPodsOnANode call
* fix old code
* apply gofumpt -w -extra
move klog/v2 import entry to bottom according to master code
