Add total earned from liquidations in aave history endpoint

[LefterisJP]

Plus some misc fixes

[codecov]

Codecov Report

Merging #1625 into develop will decrease coverage by 25.73%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           develop    #1625       +/-   ##
============================================
- Coverage    70.66%   44.92%   -25.74%     
============================================
  Files          369      254      -115     
  Lines        20365     5700    -14665     
  Branches      2923      759     -2164     
============================================
- Hits         14391     2561    -11830     
+ Misses        5218     2976     -2242     
+ Partials       756      163      -593     

Flag	Coverage Δ
#backend	?
#frontend_integration	49.80% <ø> (-0.15%)	⬇️
#frontend_unit	22.26% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
frontend/app/src/store/tasks/mutations.ts	94.11% <0.00%> (-5.89%)	⬇️
frontend/app/src/services/rotkehlchen-api.ts	52.72% <0.00%> (-1.82%)	⬇️
frontend/app/src/services/task-manager.ts	55.35% <0.00%> (-1.79%)	⬇️
frontend/app/src/store/balances/actions.ts	43.47% <0.00%> (-0.87%)	⬇️
rotkehlchen/csv_exporter.py
rotkehlchen/api/rest.py
rotkehlchen/utils/hashing.py
rotkehlchen/api/v1/resources.py
rotkehlchen/chain/ethereum/makerdao/common.py
rotkehlchen/crypto.py
... and 103 more

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[LefterisJP]

I will merge this. The only failure seen is due to 502 from a graph query in compound. This kind of errors seem like a remnant from the outage they had.