Add test for AVAX retro funding payload, fix amounts

[ghost]

Hi! I'm sending along a PR that adds a test for the AaveV3AvaxretrofundingPayload. As part of this, I reviewed the ARC and noticed that - in the original payload - the aAvaWBTC and avWBTC amounts were flipped around as well (hence the payload change). Happy to discuss anything here further!

[ghost]

Made changes to all amounts to reflect the approved amounts in the AIP (https://app.aave.com/governance/proposal/?proposalId=98) versus using the rounded amounts in the ARC.

[marczeller]

1. please review your imports
2. pls do pre execution/ post snapshots of collector balances and generate diff report on top of assert tests
3. pls merge commits ahead of yours.

[miguelmtzinf]

1. please review your imports
2. pls do pre execution/ post snapshots of collector balances and generate diff report on top of assert tests
3. pls merge commits ahead of yours.

Thanks for the feedback! Let us know if there is anything else you want us to amend or review.

[marczeller]

I can still see wrong import and test still fails are we still waiting for a commit?

[ghost]

I can still see wrong import and test still fails are we still waiting for a commit?

Yes, I was awaiting confirmation re: the snapshot question prior to pushing the remaining local change - I opened a new PR with the test executor change (#15 )