feat(transfer): add back-icon and forward-icon slots

[gp0119]

#2668

[vercel]

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Name	Status	Preview	Updated
naive-ui	✅ Ready (Inspect)	Visit Preview	Jun 21, 2022 at 8:20AM (UTC)

[codecov]

Codecov Report

Merging #3142 (8ee3d66) into main (881045a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #3142   +/-   ##
=======================================
  Coverage   63.15%   63.15%           
=======================================
  Files        1013     1013           
  Lines       21072    21072           
  Branches     5485     5485           
=======================================
  Hits        13308    13308           
  Misses       6345     6345           
  Partials     1419     1419           

Impacted Files	Coverage Δ
src/transfer/src/Transfer.tsx	52.27% <100.00%> (ø)

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