Automatically try to reshape arrays when encountering DimensionMismatch

[glwagner]

This is a small nicety for friendliness^TM. For safety^TM we throw a warning if we reshaped. Just in case it wasn't intended.

This allows things like

julia> grid = RectilinearGrid(size=(2, 3, 4), x=(0, 1), y=(0, 1), z=(0, 1))
2×3×4 RectilinearGrid{Float64, Periodic, Periodic, Bounded} on CPU with 3×3×3 halo
├── Periodic x ∈ [0.0, 1.0) regularly spaced with Δx=0.5
├── Periodic y ∈ [0.0, 1.0) regularly spaced with Δy=0.333333
└── Bounded  z ∈ [0.0, 1.0] regularly spaced with Δz=0.25

julia> c = Field{Nothing, Nothing, Center}(grid)
1×1×4 Field{Nothing, Nothing, Center} reduced over dims = (1, 2) on RectilinearGrid on CPU
├── grid: 2×3×4 RectilinearGrid{Float64, Periodic, Periodic, Bounded} on CPU with 3×3×3 halo
├── boundary conditions: FieldBoundaryConditions
│   └── west: Nothing, east: Nothing, south: Nothing, north: Nothing, bottom: ZeroFlux, top: ZeroFlux, immersed: ZeroFlux
└── data: 1×1×10 OffsetArray(::Array{Float64, 3}, 1:1, 1:1, -2:7) with eltype Float64 with indices 1:1×1:1×-2:7
    └── max=0.0, min=0.0, mean=0.0

julia> set!(c, rand(4))
┌ Warning: Reshaped 4-element Vector{Float64} to set! its data to
│ 1×1×4 Field{Nothing, Nothing, Center} reduced over dims = (1, 2) on RectilinearGrid on CPU
└ @ Oceananigans.Fields ~/Projects/Oceananigans.jl/src/Fields/set!.jl:86
1×1×4 Field{Nothing, Nothing, Center} reduced over dims = (1, 2) on RectilinearGrid on CPU
├── grid: 2×3×4 RectilinearGrid{Float64, Periodic, Periodic, Bounded} on CPU with 3×3×3 halo
├── boundary conditions: FieldBoundaryConditions
│   └── west: Nothing, east: Nothing, south: Nothing, north: Nothing, bottom: ZeroFlux, top: ZeroFlux, immersed: ZeroFlux
└── data: 1×1×10 OffsetArray(::Array{Float64, 3}, 1:1, 1:1, -2:7) with eltype Float64 with indices 1:1×1:1×-2:7
    └── max=0.172696, min=0.00231136, mean=0.0906944

which is nice when working with 1D data.

[navidcy]

lgtm!