Switch to 0.7 branch of Acount Abstraction(AA)

[v9n]

Before launch we should finalize contract and our customization. Switching to 0.7 branch with the newer entrypoint.

https://github.com/eth-infinitism/account-abstraction
https://etherscan.io/address/0x0000000071727De22E5E9d8BAf0edAc6f37da032
eth-infinitism/account-abstraction#477