Utilize TheGraph for Aave. Also support Aave borrowing.

[LefterisJP]

Fix #1458. Should also add Aave borrowing events.

[codecov]

Codecov Report

Merging #1545 into develop will decrease coverage by 0.11%.
The diff coverage is 78.37%.

@@             Coverage Diff             @@
##           develop    #1545      +/-   ##
===========================================
- Coverage    71.49%   71.37%   -0.12%     
===========================================
  Files          359      363       +4     
  Lines        19527    20027     +500     
  Branches      2778     2862      +84     
===========================================
+ Hits         13960    14294     +334     
- Misses        4841     4968     +127     
- Partials       726      765      +39     

Flag	Coverage Δ
#backend	80.65% <78.37%> (-0.50%)	⬇️
#frontend_integration	51.07% <ø> (+0.02%)	⬆️
#frontend_unit	23.04% <ø> (ø)

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

Impacted Files	Coverage Δ
rotkehlchen/api/rest.py	84.33% <ø> (-0.47%)	⬇️
rotkehlchen/db/schema.py	100.00% <ø> (ø)
rotkehlchen/history/trades.py	53.27% <0.00%> (-0.89%)	⬇️
rotkehlchen/accounting/structures.py	70.12% <33.33%> (-1.50%)	⬇️
rotkehlchen/serialization/deserialize.py	84.03% <50.00%> (-1.07%)	⬇️
rotkehlchen/chain/ethereum/aave/blockchain.py	60.83% <61.90%> (ø)
rotkehlchen/chain/ethereum/compound.py	79.10% <64.28%> (-2.58%)	⬇️
rotkehlchen/chain/ethereum/aave/graph.py	74.34% <74.34%> (ø)
rotkehlchen/chain/ethereum/aave/__init__.py	79.31% <79.31%> (ø)
rotkehlchen/db/upgrades/v18_v19.py	80.00% <80.00%> (ø)
... and 32 more

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[lgtm-com]

This pull request introduces 3 alerts when merging e90627298cdc9e60df119d0ec4643cf85202c967 into 239552b - view on LGTM.com

new alerts:

• 3 for Unused local variable