Pre-allocate `Cache` for Mooncake

[gdalle]

Replace the following lines with reading from pre-allocated contexts stored in prep:

DifferentiationInterface.jl/DifferentiationInterface/ext/DifferentiationInterfaceMooncakeExt/forward_onearg.jl

Line 41 in b985eb5

zero_dual(f),

DifferentiationInterface.jl/DifferentiationInterface/ext/DifferentiationInterfaceMooncakeExt/forward_onearg.jl

Line 43 in b985eb5

map(zero_dual ∘ DI.unwrap, contexts)...,

DifferentiationInterface.jl/DifferentiationInterface/ext/DifferentiationInterfaceMooncakeExt/forward_twoarg.jl

Line 51 in b985eb5

zero_dual(f!),

DifferentiationInterface.jl/DifferentiationInterface/ext/DifferentiationInterfaceMooncakeExt/forward_twoarg.jl

Line 54 in b985eb5

map(zero_dual ∘ DI.unwrap, contexts)...,

Already done for other backends (ForwardDiff, Enzyme)