feat(dropdowns): Allow space and cursor down to trigger opening of menus

[tmorehouse]

No description provided.

[codecov-io]

Codecov Report

Merging #1159 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1159   +/-   ##
=======================================
  Coverage   32.94%   32.94%           
=======================================
  Files         109      109           
  Lines        2853     2853           
  Branches      886      886           
=======================================
  Hits          940      940           
  Misses       1537     1537           
  Partials      376      376

Impacted Files	Coverage Δ
lib/components/nav-item-dropdown.vue	0% <ø> (ø)	⬆️
lib/components/dropdown.vue	100% <ø> (ø)	⬆️

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