Add missing services and properties

[pcasteran]

Added missing services:

• Added rebate service
• Added convert trade service

Added missing properties in some services response:

• Added missing fields in asset dividende record response.
• Added missing property 'OrigQuoteOrderQuantity' in Order
• Added missing property 'OrderListId' in Trade
• Added missing property 'UnlockConfirm' in Deposit
• Added missing property 'ConfirmNo' in Withdraw

[codecov]

Codecov Report

Merging #338 (33dc321) into master (afa0336) will decrease coverage by 0.22%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #338      +/-   ##
==========================================
- Coverage   73.19%   72.96%   -0.23%     
==========================================
  Files          60       62       +2     
  Lines        5637     5693      +56     
==========================================
+ Hits         4126     4154      +28     
- Misses       1120     1140      +20     
- Partials      391      399       +8     

Impacted Files	Coverage Δ
v2/asset_dividend_service.go	82.85% <ø> (ø)
v2/deposit_service.go	87.50% <ø> (ø)
v2/order_service.go	75.75% <ø> (ø)
v2/trade_service.go	83.33% <ø> (ø)
v2/withdraw_service.go	86.59% <ø> (ø)
v2/rebate.go	29.62% <29.62%> (ø)
v2/convert_trade.go	64.00% <64.00%> (ø)
v2/client.go	84.40% <100.00%> (+0.25%)	⬆️

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[adshao]

thanks for the great job @pcasteran