Test

perf: preallocate `Cache` during preparation for ForwardDiff #1858

Job	Run time
1 - DIT (Formalities)	5m 51s
1 - DIT (Zero)	10m 49s
1 - DIT (Standard)	9m 59s
1 - DIT (Weird)	18m 48s
1 - DI (Core/Internals)	4m 26s
1 - DI (Back/DifferentiateWith)	5m 43s
1 - DI (Core/SimpleFiniteDiff)	4m 36s
1 - DI (Back/SparsityDetector)	4m 16s
1 - DI (Core/ZeroBackends)	4m 34s
1 - DI (Back/Enzyme)	9m 11s
1 - DI (Back/FiniteDiff)	9m 10s
1 - DI (Back/FiniteDifferences)	6m 54s
1 - DI (Back/ForwardDiff)	9m 9s
1 - DI (Back/GTPSA)	8m 21s
1 - DI (Back/Mooncake)	9m 9s
1 - DI (Back/PolyesterForwardDiff)	8m 51s
1 - DI (Back/ReverseDiff)	9m 8s
1 - DI (Back/SymbolicBackends)	9m 9s
1 - DI (Back/Tracker)	5m 36s
1 - DI (Back/Zygote)	8m 56s
1 - DI (Down/Flux)	4m 39s
1 - DI (Down/Lux)	3m 20s
	2h 50m 35s

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