feat(earn): add function for fetching aave rewards

[satish-ravi]

Description

As the title

Test plan

Unit tests

Related issues

• Part of ACT-1180

Backwards compatibility

Yes

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• Continue to work without code changes, OR trigger a compilation error (guaranteeing we find it when a new network is added)

[codecov]

Codecov Report

Attention: Patch coverage is 91.89189% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 86.24%. Comparing base (db7459a) to head (50d1834).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5422      +/-   ##
==========================================
- Coverage   86.24%   86.24%   -0.01%     
==========================================
  Files         750      751       +1     
  Lines       30556    30593      +37     
  Branches     5216     5219       +3     
==========================================
+ Hits        26354    26385      +31     
- Misses       3974     3980       +6     
  Partials      228      228              

Files	Coverage Δ
src/abis/AaveIncentivesV3.ts	100.00% <100.00%> (ø)
src/web3/networkConfig.ts	100.00% <100.00%> (ø)
test/values.ts	100.00% <100.00%> (ø)
src/earn/poolInfo.ts	88.23% <89.65%> (+1.87%)	⬆️

... and 6 files with indirect coverage changes

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