fix: add millisecond

[HelloAny]

issue: ant-design/ant-design#28591

添加showTime中defaultValue的毫秒获取

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[codecov[bot]]

Codecov Report

Merging #200 (4f7af82) into master (42f853b) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #200   +/-   ##
=======================================
  Coverage   99.61%   99.61%           
=======================================
  Files          45       45           
  Lines        2094     2103    +9     
  Branches      616      616           
=======================================
+ Hits         2086     2095    +9     
  Misses          6        6           
  Partials        2        2           

Impacted Files	Coverage Δ
src/generate/dateFns.ts	100.00% <100.00%> (ø)
src/generate/dayjs.ts	100.00% <100.00%> (ø)
src/generate/moment.ts	100.00% <100.00%> (ø)
src/panels/DatetimePanel/index.tsx	100.00% <100.00%> (ø)

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[HelloAny]

稍后补上测试

[afc163]

Please add test case.