[swift-evolution] [Pitch] improve import sentence: allow import specific nested types

[Cao Jiannan]

Now Swift 3 allow us import specific enum/struct from module, but it only allow us import top-level declaration.

For example:

in MyFoudnation framework:

public struct Time {
    public struct DateOnly {}
}

in App target:
I can only
 
import struct MyFoundation.Time

But I cannot 

import struct MyFoundation.Time.DateOnly

So allow developer import nested types

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