💡 Add `getComment()` method to `ColumnInterface`

### I have an idea!

**Problem:**

`\Cycle\Database\ColumnInterface` doesn't have something like `getComment()` method.
Also no one Driver directory contains `comment` keyword :)

So the idea is to have a `getComment()` method inside `ColumnInterface` to be able to introspect as more properties as we can.
