feat: allow invest to ERC4626 vaults

[antoncoding]

TLDR

• Allow contracts to take an optional input when creating challenge: strategy or vault
• If the address is specified, treat it like ERC4626, verify if the underlying asset is the challenge token
• deposit into the vault, and store the responding share the user entitled for this challenge
• when claiming, swap the share back to the original token by withdraw with receiver being the user

Details

• What if withdraw fail (no liquidity in lending protocol for example) -> transfer the share back for users?

[cc03668]

也可以 pivot 成目標是去跟別的 protocol 合作，而不是讓 user 賺錢

• 用 aa bundler 創挑戰，要求 user 都要用某個 token 加入挑戰，degen token 感覺很適合，可以直接跟比較強大的社群合作

Action Item

• 新增多個 token 的選項