implements directive doesn't enforce all declared properties from vyi files

[cyberthirst]

Version Information

• vyper Version (output of vyper --version): 063f190

What's your issue about?

following compiles

# main.vy
import ITest

implements: ITest

@external
@view
def c() -> uint256:
    return 1

# ITest.vyi
c: public(constant(uint256)) = 32

also, as mentioned in: #3978 (comment), the interface can declare a var in transient, and it can end up being implemented as a regular function