add missing defaultFormat

[zombieJ]

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This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

What's the background?

Miss default datePicker dateTime format:

Changelog description (Optional if not new feature)

1. Add missing DatePicker dateTime default format
2. 增加 DatePicker 的 dateTime 格式。

Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[codecov]

Codecov Report

Merging #14593 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #14593      +/-   ##
==========================================
- Coverage   94.43%   94.41%   -0.03%     
==========================================
  Files         333      333              
  Lines        7264     7265       +1     
  Branches     1788     1823      +35     
==========================================
- Hits         6860     6859       -1     
- Misses        389      391       +2     
  Partials       15       15

Impacted Files	Coverage Δ
components/date-picker/wrapPicker.tsx	100% <ø> (ø)	⬆️
components/upload/UploadList.tsx	88.03% <0%> (-1.71%)	⬇️
components/form/Form.tsx	94.11% <0%> (ø)	⬆️
components/menu/SubMenu.tsx	92.85% <0%> (ø)	⬆️
components/input/TextArea.tsx	82.85% <0%> (+0.24%)	⬆️

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