add precompile statements

[t-bltg]

Using SnoopPrecompile, results on 1.8.1.

before

julia> @time_imports using MarchingCubes
      0.3 ms  SnoopPrecompile
      3.4 ms  StaticArraysCore
    892.3 ms  StaticArrays
      1.2 ms  MarchingCubes

julia> @time mc = MarchingCubes.scenario(4, 4, 4; F = Float64, I = Int);
  0.068600 seconds (4.15 k allocations: 187.344 KiB, 99.94% compilation time)

julia> @time march(mc)
  2.529913 seconds (3.61 M allocations: 183.588 MiB, 11.35% gc time, 99.90% compilation time)

pr

julia> @time_imports using MarchingCubes
      0.3 ms  SnoopPrecompile
      3.6 ms  StaticArraysCore
    951.1 ms  StaticArrays
    156.1 ms  MarchingCubes

julia> @time mc = MarchingCubes.scenario(4, 4, 4; F = Float64, I = Int);
  0.066706 seconds (4.15 k allocations: 187.016 KiB, 99.93% compilation time)

julia> @time march(mc)
  1.146681 seconds (91.12 k allocations: 3.361 MiB, 100.00% compilation time)

[codecov]

Codecov Report

Merging #10 (5c29c05) into main (fa3e135) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files           2        2           
  Lines         440      445    +5     
=======================================
+ Hits          439      444    +5     
  Misses          1        1           

Impacted Files	Coverage Δ
src/MarchingCubes.jl	99.75% <ø> (ø)
src/example.jl	100.00% <100.00%> (ø)

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