Add Static Arrays Extension

[max-vassili3v]

This is a continuation of this PR.

This PR adds an extension of StaticArrays.jl. This ends up fixing an issue where adding or subtracting by Zeros always returns a dense Array . By adding this extension, we resolve ambiguity issues and thus are able to override +(a::AbstractArray, b::Zeros) so that it preserves the type of a.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.83%. Comparing base (3e305a8) to head (c9f5fa4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #427   +/-   ##
=======================================
  Coverage   99.82%   99.83%           
=======================================
  Files           8        9    +1     
  Lines        1156     1177   +21     
=======================================
+ Hits         1154     1175   +21     
  Misses          2        2           

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[dlfivefifty]

Can you bump the minor version? (So v1.16)