feat(comp: transfer): add customAdditional

[danranVm]

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• Docs and demo have been added/updated or not needed

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What kind of change does this PR introduce?

• Bugfix
• Feature
• Component style update
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Application (the showcase website) / infrastructure changes
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[idux-bot]

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[codecov]

Codecov Report

Merging #872 (96e181d) into main (593f86f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##             main     #872    +/-   ##
========================================
  Coverage   93.45%   93.46%            
========================================
  Files         657      657            
  Lines       64760    64944   +184     
  Branches     7847     7862    +15     
========================================
+ Hits        60522    60699   +177     
- Misses       4238     4245     +7     

Impacted Files	Coverage Δ
...ents/_private/checkable-list/src/CheckableList.tsx	93.54% <100.00%> (+0.05%)	⬆️
.../_private/checkable-list/src/CheckableListItem.tsx	100.00% <100.00%> (ø)
...es/components/_private/checkable-list/src/types.ts	100.00% <100.00%> (ø)
packages/components/transfer/src/types.ts	99.46% <100.00%> (+0.03%)	⬆️
packages/pro/transfer/src/types.ts	100.00% <100.00%> (ø)
packages/components/dropdown/src/Dropdown.tsx	33.80% <0.00%> (-2.57%)	⬇️
packages/components/checkbox/src/CheckboxGroup.tsx	93.93% <0.00%> (-2.43%)	⬇️
packages/pro/layout/src/types.ts	100.00% <0.00%> (ø)
packages/components/menu/src/Menu.tsx	100.00% <0.00%> (ø)
packages/components/menu/src/token.ts	100.00% <0.00%> (ø)
... and 17 more

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