This new cache hierarchy does not require the cache stores within it to complete every operation synchronously. When the child cache stores start to do async I/O, this hierarchy will support that instead of blocking like the existing hierarchy does.
This is a snapshot of the work in progress that is only implemented for the functions in ILegacyCacheStore.
#rb Zousar.Shaker
#rnx
#preflight 61f37e487a7f0d39ddd2d38b
#ROBOMERGE-AUTHOR: devin.doucette
#ROBOMERGE-SOURCE: CL 18768547 in //UE5/Release-5.0/... via CL 18768556 via CL 18768581
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v903-18687472)
[CL 18768594 by devin doucette in ue5-main branch]
