Add Dividend Service

[egelis]

Added the ability to receive a list of dividends
Taken from branch v1

[codecov]

Codecov Report

Merging #309 (b4b77b7) into master (aea3128) will decrease coverage by 0.00%.
The diff coverage is 83.78%.

@@            Coverage Diff             @@
##           master     #309      +/-   ##
==========================================
- Coverage   73.99%   73.99%   -0.01%     
==========================================
  Files          55       56       +1     
  Lines        5269     5311      +42     
==========================================
+ Hits         3899     3930      +31     
- Misses       1009     1016       +7     
- Partials      361      365       +4     

Impacted Files	Coverage Δ
v2/asset_dividend_service.go	82.85% <82.85%> (ø)
v2/client.go	84.51% <100.00%> (+0.13%)	⬆️
v2/trade_service.go	83.33% <0.00%> (-3.45%)	⬇️

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