Speed up transform!(grid, f)

[KnutAM]

Speeds up transform! and removes allocations

using Ferrite, BenchmarkTools
grid = generate_grid(Quadrilateral, (200,200));
f(x::Vec{2}) = x*1.01;
gtmp = deepcopy(grid); @btime transform!($gtmp, $f); # PR:  30.600 μs (0 allocations: 0 bytes)
gtmp = deepcopy(grid); @btime transform!($gtmp, $f); # master: 86.100 μs (2 allocations: 631.36 KiB)

Note: It disallows AbstractGrid as it assumes the grid's nodes are stored as Node and that the grid has the field grid.nodes.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (247d7c3) 93.45% compared to head (a75ea52) 93.44%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #675      +/-   ##
==========================================
- Coverage   93.45%   93.44%   -0.01%     
==========================================
  Files          29       29              
  Lines        4263     4259       -4     
==========================================
- Hits         3984     3980       -4     
  Misses        279      279              

Impacted Files	Coverage Δ
src/Grid/grid.jl	90.26% <100.00%> (-0.11%)	⬇️

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