kep-5278: nominated node name for an expected pod placement (#5287)

* kep-5278: nominated node name for an expected pod placement

* add prr

* update toc

* add motivation

* update based on the discussion

* update toc

* fix based on the discussion

* NominatedNodeName KEP adjustments

* explain the caching mechanism

* fix based on suggestions

* add: fill in other sections

* fix wordings

* fix typos

* fix based on suggestions

* fix based on suggestions

* update toc

* Few clarifying comments

* update toc

---------

Co-authored-by: Wojciech Tyczyński <[email protected]>

Author: sanposhiho

keps/prod-readiness/sig-scheduling/5278.yaml

@@ -0,0 +1,3 @@
+kep-number: 5278
+beta:
+  approver: "@soltysh"