Add onBehalfOf parameter to AToken handleRepayment function

[kartojal]

Closes #742

[codecov-commenter]

Codecov Report

Base: 99.65% // Head: 99.65% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (db872fd) compared to base (678151d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           feat/3.0.1     #743   +/-   ##
===========================================
  Coverage       99.65%   99.65%           
===========================================
  Files              45       45           
  Lines            2298     2299    +1     
  Branches          420      420           
===========================================
+ Hits             2290     2291    +1     
  Misses              8        8           

Impacted Files	Coverage Δ
...acts/protocol/libraries/logic/LiquidationLogic.sol	100.00% <ø> (ø)
contracts/protocol/libraries/logic/BorrowLogic.sol	100.00% <100.00%> (ø)
...tracts/protocol/libraries/logic/FlashLoanLogic.sol	100.00% <100.00%> (ø)
contracts/protocol/tokenization/AToken.sol	100.00% <100.00%> (ø)

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