HouseKeeping add updated crvEur strategy

[storming0x]

HouseKeeping add crvEUR strategy latest update from this address: 0x83e7399113561ae691c413ed334137D3839e2302

Should follow similar house keeping PRs including:

• refactoring interfaces
• update calls in code to use interfaces
• CI should be green before merging

Example PRs to follow https://github.com/iearn-finance/yearn-protocol/pull/89/files

[ghost]

will help