add internal universal transfer service

[baixuexue123]

• InternalUniversalTransferService
• InternalUniversalTransferHistoryService

[codecov[bot]]

Codecov Report

Merging #393 (3bf6969) into master (8b5878a) will increase coverage by 0.25%. The diff coverage is 87.25%.

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
+ Coverage   70.02%   70.27%   +0.25%     
==========================================
  Files          74       75       +1     
  Lines        6838     6940     +102     
==========================================
+ Hits         4788     4877      +89     
- Misses       1550     1558       +8     
- Partials      500      505       +5     

Impacted Files	Coverage Δ
v2/internal_universal_transfer_service.go	86.73% <86.73%> (ø)
v2/client.go	81.05% <100.00%> (+0.23%)	:arrow_up:

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