Add recipe for Vec

[eliascarv]

Examples:

vs = [Vec(x, y) for x in 1:5 for y in 1:5]
viz(vs, color=1:25)

vs = vs = [Vec(x, y, z) for x in 1:3 for y in 1:3 for z in 1:3]
viz(vs, color=1:27)

closes JuliaEarth/GeoStats.jl#381

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (6113b49) 90.17% compared to head (632f348) 89.85%.

Files	Patch %	Lines
ext/vector.jl	0.00%	11 Missing ⚠️
ext/fallbacks.jl	0.00%	4 Missing ⚠️
ext/MeshesMakieExt.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #695      +/-   ##
==========================================
- Coverage   90.17%   89.85%   -0.33%     
==========================================
  Files         158      159       +1     
  Lines        4470     4486      +16     
==========================================
  Hits         4031     4031              
- Misses        439      455      +16     

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