feat: add generateKey option to factories

[levithomason]

This PR pulls the latest autoGenerateKey factory option from SUIR. In doing so, I'll also create the specification for shorthand props and factories so we can discuss the pattern.

Rich history behind this is here: Semantic-Org/Semantic-UI-React#2418

[dvdzkwsk]

Told ya so.

[dvdzkwsk]

Lol, you are actually using this PR. I thought it was throwaway, lol...

[codecov]

Codecov Report

Merging #3 into master will increase coverage by 14.26%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master       #3       +/-   ##
===========================================
+ Coverage    69.8%   84.06%   +14.26%     
===========================================
  Files          75       58       -17     
  Lines        1202      778      -424     
  Branches      228      157       -71     
===========================================
- Hits          839      654      -185     
+ Misses        358      120      -238     
+ Partials        5        4        -1

Impacted Files	Coverage Δ
src/components/Accordion/Accordion.tsx	59.52% <ø> (ø)	⬆️
src/components/Header/Header.tsx	93.33% <100%> (ø)	⬆️
test/specs/commonTests/implementsCreateMethod.tsx
test/specs/commonTests/rendersChildren.tsx
test/specs/commonTests/implementsClassNameProps.ts
test/specs/commonTests/hasUIClassName.tsx
test/setup.ts
test/specs/commonTests/commonHelpers.ts
test/utils/consoleUtil.ts
test/specs/commonTests/classNameHelpers.tsx
... and 8 more

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