Conversions of StokesArrays and ThermalArrays from GPU to CPU

[albert-de-montserrat]

Move a GPU StokesArrays or ThermalArrays to the CPU:

ni = 10, 10
stokes  = StokesArrays(ni, ViscoElastic)
thermal = ThermalArrays(ni)

@assert Array(stokes.V) isa Velocity{Matrix{Float64}}
@assert Array(stokes.τ) isa SymmetricTensor{Matrix{Float64}}
@assert Array(stokes.R) isa Residual{Matrix{Float64}}
@assert Array(stokes.P) isa Matrix
@assert Array(stokes)   isa StokesArrays
@assert Array(thermal)  isa ThermalArrays{Matrix{Float64}}

[albert-de-montserrat]

CC @aelligp

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 34.37500% with 21 lines in your changes are missing coverage. Please review.

Files	Patch %	Lines
src/array_conversions.jl	34.37%	21 Missing ⚠️

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