Adding format array support

[SamKirkland]

Adds array formatting support to match picker format
Will be used to resolve this issue in antd ant-design/ant-design#13163

[codecov]

Codecov Report

Merging #198 into master will decrease coverage by 0.19%.
The diff coverage is 84.00%.

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
- Coverage   91.86%   91.66%   -0.20%     
==========================================
  Files           6        6              
  Lines         381      396      +15     
  Branches       99      102       +3     
==========================================
+ Hits          350      363      +13     
- Misses         31       33       +2     

Impacted Files	Coverage Δ
src/TimePicker.jsx	92.52% <60.00%> (-1.60%)	⬇️
src/Combobox.jsx	93.58% <100.00%> (ø)
src/Header.jsx	89.88% <100.00%> (+1.28%)	⬆️

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