Split `account.move` into `account.move` and `authenticator_function.move`

[valeriyr]

1. account.move should contain the functions that have custom rules performed by the IOTA Move bytecode verifier + AuthenticatorFunctionRefV1Key + borrow_auth_func_ref_v1 + has_auth_func_ref_v1.
2. authenticator_function.move should contain AuthenticatorFunctionRefV1 and all the related methods.

This will help to make the IOTA Move bytecode verifier cleaner by eliminating the need to check additional functions.