Add Alchemix Integration

[alsco77]

Notes

• Add AlchemixIntegration contract
• Add fork tests for alUSD FP

Checklist

• Fix failing CI
• Deploy new vault
• AS verify deployment (0x0997dDdc038c8A958a3A3d00425C16f8ECa87deb)
  • ProxyAdmin
  • Storage
  • Code
• Updated gitbook/etherscan/etc
• Fund with small amount of MTA
• App staging deploy
• Migrated funds to PlatformIntegration
• Finalise fork tests
• Liquidator
  • Add unit tests for ALCX coverage
  • Complete fork tests for liquidator
    • regression of COMP and stkAAVE
• Beta testing
  • mint (watch deposit into stakingpool)
  • redeem (withdrawal from stakingpool)
  • claimRewards
  • deposit to vault
  • claim from vault
• App main deploy & funding
• Release new @mstable/protocol

[alsco77]

Notes occurred during review:

• Funding the vault critical for beta testing (should do this asap)
• Some inconsistencies in structure/formatting between this and other integrations. e.g constructor args (rewardsToken before platform address could cause some unintended mistake), var naming (platform vs stakingPools), missing bAssetToPToken & event (unused, but may be needed for front end)
• Unused rewardsClaimed event