Disallow optimize and evm-version pragma's in .vyi files

[pcaversaccio]

I don't think it makes any sense to have the optimize and evm-version pragma's in .vyi files. It might even give wrong implications that such an interface can only be imported and implementsed using these specific pragma directives.

[pcaversaccio]

This also includes the experimental-codegen pragma statement.

[charles-cooper]

i guess we check that the settings object from pre_parsing is equal to Settings()

[cyberthirst]

this inspired me to test

# main.vy
import ITest

implements: ITest

@external
@view
def c() -> uint256:
    return 1
    
# ITest.vyi
c: public(transient(uint256))

compiles against 063f190

[sandbubbles]

I think there will be a straightforward solution once #4290 is done.